a. The margin of error for the proportion of all adults who think things are going in the wrong direction for 90% confidence is 0.017.
b. The correct choice is: "We are 90% confident that the observed proportion of adults that responded 'wrong track' is within 0.017 of the population proportion."
a) To calculate the margin of error for a 90% confidence interval, we need to use the formula:
[tex]ME = z\sqrt{ (pq/n) }[/tex]
where:
z = the z-score for a 90% confidence interval, which is 1.645
p = the proportion of adults who said things were going in the wrong direction, which is 0.44
q = the complement of p, which is 1 - 0.44 = 0.56
n = the sample size, which is 2306.
Plugging in these values, we get:
ME = 1.645sqrt(0.440.56/2306) = 0.017
Therefore, the margin of error for the proportion of all adults who think things are going in the wrong direction for 90% confidence is 0.017.
b) The correct choice is: "We are 90% confident that the observed proportion of adults that responded 'wrong track' is within 0.017 of the population proportion."
This means that if we were to conduct the same survey many times and calculate the confidence interval each time, we would expect 90% of those intervals to contain the true proportion of adults who think things are going in the wrong direction.
The margin of error of 0.017 indicates the maximum amount by which the sample proportion may differ from the true population proportion.
For similar question on proportion.
https://brainly.com/question/29006912
#SPJ11
to find the area between two z-scores, we look up the area to the ____ of each value and subtract the smaller area from the larger area.
To find the area between two z-scores, we look up the area to the right of each value and subtract the smaller area from the larger area.
What is z-score?The number of standard deviations from the mean is simply defined as a z score. The z-score is determined by subtracting the mean from the test value and dividing it by the standard value.
To find the area between two z-scores, we first need to find the standard normal distribution values (Z-scores) for the given values using the standard normal distribution table. Once we find the Z-scores, we can look up the area to the left of each value in the standard normal distribution table. We subtract the smaller area from the larger area to get the area between the two Z-scores.
For example,
If we want to find the area between Z = 1.5 and Z = 2.0, we would first look up the area to the left of Z = 1.5 and Z = 2.0 in the standard normal distribution table. Let's say we find that the area to the left of Z = 1.5 is 0.9332 and the area to the left of Z = 2.0 is 0.9772. To find the area between these two Z-scores, we subtract the smaller area from the larger area, which gives us:
Area between Z = 1.5 and Z = 2.0 = 0.9772 - 0.9332 = 0.0440
Therefore, the area between Z = 1.5 and Z = 2.0 is 0.0440.
Therefore, to find the area between two z-scores, we look up the area to the right of each value and subtract the smaller area from the larger area.
Learn more about z-score on:
https://brainly.com/question/29367643
#SPJ4
Why does the government give unemployment?
Answer:
i don't have idea for answer
Step-by-step explanation:
i
don't
have
idea
for
answer
a convention store has 20 bottles of water.Each day a supplier delivers the same number of bottles to the store.The store does not sell any bottles of water for 3 days and now has 110 bottles. what is the rate of change in the store’s supply of bottled water each day
Answer:
x = 30
Rate of Change: + 30/day
Step-by-step explanation:
20 + 3x = 110
-20 -20
3x = 90
/3 /3
x = 30
If y varies directly as x^2 and y=400 when x=16,find y when x=4.
Answer:
25
Step-by-step explanation:
If y varies directly as x^2, we can write:
y = kx^2
where k is the constant of proportionality.
To find k, we can use the given information that y = 400 when x = 16:
400 = k(16)^2
400 = 256k
k = 400/256
k = 1.5625
Now that we know the value of k, we can use the equation y = kx^2 to find y when x = 4:
y = 1.5625(4)^2
y = 25
Therefore, when x = 4, y is 25.
to transform a raw score (e.g., thumb length in mm) into a z-score, we take the score and divide by the standard deviation of the variable. what is a correct interpretation of the resulting z-score for thumb length? responses
To calculate a z-score for a variable, such as thumb length in millimeters, we take the raw score and divide it by the standard deviation of the variable.
Once we have calculated the z-score for thumb length, we need to interpret what it means. The interpretation of a z-score depends on the context and the characteristics of the distribution.
A z-score of 0 indicates that the raw score is equal to the mean of the distribution. A z-score of 1 means that the raw score is one standard deviation above the mean, while a z-score of -1 means that the raw score is one standard deviation below the mean.
For example, suppose we have a sample of thumb lengths and the mean length is 60 mm, with a standard deviation of 5 mm. If someone's thumb length is 70 mm, their z-score would be (70 - 60) / 5 = 2. This means that their thumb length is two standard deviations above the mean of the distribution. We can interpret this as meaning that their thumb length is relatively large compared to the average thumb length in the sample.
It's important to note that the interpretation of a z-score depends on the characteristics of the distribution, such as the mean and standard deviation. In different distributions, the same z-score may correspond to different raw scores and have different interpretations.
To know more about Standard Deviation here
https://brainly.com/question/16555520
#SPJ4
there are multiple graph with degree sequence (4,4,4,4,4,4,2). explain why none of them are bipartite.
None of the graphs with the given degree sequence (4,4,4,4,4,4,2) can be bipartite.
To understand why none of the graphs with the given degree sequence (4,4,4,4,4,4,2) are bipartite, let's first define the key terms:
1. Degree: The degree of a vertex in a graph is the number of edges incident to it.
2. Sequence: A degree sequence is a list of the degrees of each vertex in a graph.
3. Bipartite: A graph is bipartite if its vertices can be partitioned into two disjoint sets such that no two vertices within the same set are adjacent.
Now, let's analyze the given degree sequence (4,4,4,4,4,4,2):
1. There are 7 vertices in the graph.
2. The sum of the degrees is 4+4+4+4+4+4+2 = 26, which is even (a necessary condition for a graph to be bipartite).
For a graph to be bipartite, it must satisfy the Handshaking Lemma. The Handshaking Lemma states that the sum of the degrees of all vertices in a set should be equal to the sum of the degrees of all vertices in the other set. In other words, the sum of the degrees of all vertices in one set is equal to the number of edges crossing between the two sets.
Let's assume we can divide the vertices into two disjoint sets, A and B. Since each vertex with degree 4 is adjacent to 4 vertices, it must be connected to vertices in the opposite set. However, we have six vertices with degree 4, so the total sum of degrees of vertices in set A would be 6 * 4 = 24, while the vertex with degree 2 in set B would only account for 2. This contradicts the Handshaking Lemma, as 24 ≠ 2.
Hence, none of the graphs with the given degree sequence (4,4,4,4,4,4,2) can be bipartite.
to learn more about bipartite click here:
brainly.com/question/30889414
#SPJ11
HELP ME FAST AND PLEASE AND THANK YOU!!!!!!!!!!!! 10 MINUTES HEEEELP!!!!!!
C at a distance from point of origin is 1.
The coordinates of E is 1/3.
H's coordinate is 7/6.
How to calculate points on number line?a. To plot point C such that it is 1 unit away from the origin, can be done by identifying a point on the number line that is one unit away from the origin. This point on the number line is at 1.
b. Find a point on the number line that is less than 1 unit distant from the origin to plot point E closer to the origin than point C. Point E becomes 3/5 unit from the origin in this example, thus its coordinate is 1/3.
c. In order to show a point that is halfway of C and E, first calculate their coordinates. C has a value of 2, while E has a coordinate of 1/3. As a result, H's coordinate is (2 + 1/3)/2 = (7/3)/2 = 7/6.
Find out more on number line here: https://brainly.com/question/24644930
#SPJ1
where do you mark mean and median on a density curve
The mean and median on a density curve may be very close or even the same, especially for symmetric distributions.
For skewed distributions, the mean and median may be quite different.
On a density curve, the mean and median can be marked as follows:
Mean:
The mean of a density curve represents the average value of the data.
It is also known as the expected value.
The mean is the point at which the density curve would balance if it were made of a solid material.
To mark the mean on a density curve, locate the point where the curve is cut in half by its own weight.
This point is the mean of the distribution.
It can be represented by a vertical line drawn through this point on the x-axis.
Median:
The median of a density curve is the point that divides the area under the curve in half.
It is the point that separates the lower 50% of the data from the upper 50%.
To mark the median on a density curve, locate the point where the curve intersects the horizontal line at the midpoint of the area under the curve.
This point is the median of the distribution.
It can be represented by a vertical line drawn through this point on the x-axis.
In general, the mean is more sensitive to outliers than the median, which makes the median a better measure of central tendency for distributions with extreme values.
For similar questions on density curve
https://brainly.com/question/30631736
#SPJ11
Hunter has 2
1
2
hours to spend at Wally's Game World. He spends
1
4
of an hour playing arcade games, and he spends the rest of the time playing miniature golf with his friends. If each round of golf takes
3
4
of an hour, how many rounds does Hunter play?
The total number of rounds that Hunter played would be = 2 rounds.
How to calculate the total number of rounds played by Hunter?The total number of hours he has to spend at the Wally's Game World = 2.5 hours
The number of hours he spent playing arcade games, = 0.25hr
The number of hours he spent on the rest of the games = 2.5-0.25 = 2.25 hours
But each round of golf = 1 hour
The number of round of golf game he played approximately 2 rounds.
Learn more about hours here:
https://brainly.com/question/28036423
#SPJ1
the probability that a random sample of size will have a mean gestation period within days of the mean is____
A sample chosen at random of size 18 will most likely have a median gestation duration that is around 11 days of the average with a 62.95% probability.
Assuming the population standard deviation is known to be 5 days and the population mean gestation period is 270 days,we can use the formula for the standard error of the mean to calculate the probability that a sample mean will fall within a certain range of the population mean.
The standard deviation of the population divided by the sample size's square root gives us 1.1785 as the median error of the mean, or 5 / sqrt(18).
The probability that the sample mean gestation period will fall within 11 days of the population mean is equivalent to finding the probability that a standard normal distribution falls between -0.9326 and 0.9326, where (-11/1.1785) and (11/1.1785) represent the z-scores for 11 days below and above the population mean, respectively. Using a standard normal distribution table or calculator, this probability is approximately 0.6295 or 62.95%. As a result, here exists a 62.95% chance that an 18-person random sample will have an average gestation time that is within 11 days from the mean.
To know more about probability visit :
https://brainly.com/question/30034780
#SPJ4
Complete question :
What is the probability a random sample of size 18 will have a mean gestation period within 11 days of the mean?
if you wanted to predict the sales price based upon square footage for homes in this subdivision, what would be the slope of the least squares regression line?
The slope represents the predicted change in sales price for each additional square foot of a home. Using this slope, you can then create the regression line equation, which will help you predict the sales price based on square footage for homes in the subdivision.
To predict the sales price based on square footage for homes in this subdivision using the least squares regression line, you would need to follow these steps:
1. Collect data: Gather data on the sales prices and square footages of homes in the subdivision. This data will be used to calculate the regression line.
2. Calculate the mean: Find the average (mean) sales price and average square footage for the homes in your data set.
3. Calculate deviations: For each home, calculate the deviation of its sales price from the mean sales price and the deviation of its square footage from the mean square footage.
4. Calculate products: Multiply the deviations of sales price and square footage for each home, and then sum the products.
5. Calculate squared deviations: Square the deviations of square footage for each home, and then sum the squared deviations.
6. Calculate the slope: Divide the sum of products by the sum of squared deviations. This will give you the slope of the least squares regression line.
Learn more about regression line here:
brainly.com/question/7656407
#SPJ11
(L3) The orthocenter will lie in the interior of a(n) _____ triangle.
The orthocenter will lie in the interior of a(n) acute triangle. In Euclidean geometry, the orthocenter is a point where the three altitudes of a triangle intersect.
All three angles in an acute triangle are less than 90 degrees. If we draw the altitudes from each vertex, they will all intersect inside the triangle. Therefore, the orthocenter of an acute triangle will always be located in the interior of the triangle.
On the other hand, in an obtuse triangle, at least one angle is greater than 90 degrees. In this case, one of the altitudes will lie outside of the triangle, so the orthocenter will be located outside of the triangle.
Learn more about orthocenter
https://brainly.com/question/29576583
#SPJ4
Identify a box-and-whisker plot of the given data. 15, 8, 5, 18, 20, 13, 30, 28, 9, 15, 17, 24, 15, 18, 26
The box starts at 13 and ends at 24, with a line at 17 inside the box. The whiskers extend from 5 to 30.
The box-and-whisker plot of the given data 15, 8, 5, 18, 20, 13, 30, 28, 9, 15, 17, 24, 15, 18, 26 is as follows:
Minimum: 5
First quartile: 13
Median: 17
Third quartile: 24
Maximum: 30
To draw the box-and-whisker plot, we first need to find the five-number summary of the data, which consists of the minimum, the first quartile, the median, the third quartile, and the maximum. The box represents the middle 50% of the data, with the bottom of the box at the first quartile and the top of the box at the third quartile.
The box starts at 13 and ends at 24, with a line at 17 inside the box. The whiskers extend from 5 to 30.
Learn more about box-and-whisker plot here
https://brainly.com/question/22651823
#SPJ4
Find the area of the circle leave your answer in terms of pi.
Answer:
Step-by-step explanation:
area of circle=pi*r^2
R + 19 < 9 solve for r
The solution to the inequality R + 19 < 9 is R < -10
What is the solution to the inequality?Given the inequality in the question:
R + 19 < 9
The inequality R + 19 < 9 means that the value of "R" that we are looking for must be less than some number that will make the inequality true.
To solve for "R", we need to isolate the variable "R" on one side of the inequality.
We can isolate R on one side of the inequality by subtracting 19 from both sides:
R + 19 < 9
R + 19 - 19 < 9 - 19
Simplifying the above inequality, we get:
R < 9 - 19
R < -10
Therefore, any value of r that is less than -10 will make the inequality true.
Learn more about inequality here: https://brainly.com/question/30228778
#SPJ1
For each of the following relations, decide if it is reflexive, symmetric, and or transitive.
Prove your answers.
(a) Ri is the relation on R given by Ri = {(z,y) ERx R: |x-y <1}.
(b) Let A be a set with at least two elements. Let R be the relation on A given by
(c) Rs is the relation on Z given by R3 = {(z,y) ⬠Zà Z: xy > 0).
(d) R, is the relation on Z given by R, = {(2, y) ⬠Zx Z: 3|(à + 2y)}. (e) Rs is the relation on Z given by Rs = {(x,y) ⬠Zx Z: there exists k ⬠N such that
elyk and yak).
In this question, we were given five relations and asked to determine if they are reflexive, symmetric, and/or transitive.
(a) The relation Ri on R is reflexive, symmetric, and transitive.
(b) The relation R on A is not reflexive, not symmetric, and transitive.
(c) The relation Rs on Z is not reflexive, not symmetric, and transitive.
(d) The relation R, on Z is not reflexive, not symmetric, and not transitive.
(e) The relation Rs on Z is reflexive, not symmetric, and transitive.
What is reflexive relation?A reflexive connection is a relationship between items of a set A in which each element is related to itself. As the name implies, the image of each element of the set is its own reflection. In set theory, a reflexive relation is an essential concept.
(a) Ri is reflexive, symmetric, and transitive.
- Reflexive: For any x ∈ R, (x, x) ∈ Ri since |x - x| = 0 < 1.
- Symmetric: For any (x, y) ∈ Ri, we have |x - y| < 1, which implies |y - x| < 1. Therefore, (y, x) ∈ Ri.
- Transitive: For any (x, y), (y, z) ∈ Ri, we have |x - y| < 1 and |y - z| < 1. Adding these inequalities, we get |x - z| < 2, which implies (x, z) ∈ Ri.
(b) R is not reflexive, symmetric, or transitive.
- Not reflexive: For any x ∈ A, (x, x) ∉ R since x - x = 0 is not a positive integer.
- Not symmetric: For any distinct x, y ∈ A, if (x, y) ∈ R, then x - y = 1, which implies y - x = -1 is not a positive integer. Therefore, (y, x) ∉ R.
- Not transitive: Let A = {1, 2, 3} and R = {(1, 2), (2, 3)}. Then (1, 3) is not in R since 3 - 1 = 2 is not a positive integer.
(c) R3 is not reflexive, symmetric, or transitive.
- Not reflexive: For any x ∈ Z, (x, x) ∉ R3 since x * x = x^2 is not greater than 0.
- Symmetric: For any (x, y) ∈ R3, we have xy > 0, which implies yx > 0. Therefore, (y, x) ∈ R3.
- Not transitive: Let x = -1, y = 2, and z = -1. Then (x, y) ∈ R3 and (y, z) ∈ R3, but (x, z) = (-1, -1) ∉ R3 since xz = 1 is not greater than 0.
(d) R, is not reflexive, symmetric, or transitive.
- Not reflexive: For any y ∈ Z, (y, y) ∉ R, since 3 does not divide y + 2y = 3y.
- Not symmetric: For y = 1 and z = 2, we have (2, 1) ∉ R, but (1, 2) ∈ R since 3 divides 1 + 4 = 5.
- Not transitive: Let x = 2, y = 1, and z = 5. Then (x, y) ∈ R, (y, z) ∈ R, but (x, z) = (2, 5) ∉ R since 3 does not divide 2 + 10 = 12.
(e) Rs is the relation on Z given by Rs = {(x,y) ⬠Zx Z: there exists k ⬠N such that elyk and yak).
- Reflexive: This relation is not reflexive because (1, 1) ∉ Rs as there does not exist k such that 1 x k = 1.
- Symmetric: This relation is not symmetric because, for example, (1, 2) ∈ Rs but (2, 1) ∉ Rs since there does not exist k such that 2 x k = 1.
- Transitive: This relation is not transitive. For example, let x = 1, y = 2, and z = 4. Then (x, y) ∈ Rs and (y, z) ∈ Rs, but (x, z) ∉ Rs since there does not exist k such that 1 x k = 4.
In short, in this question, we were given five relations and asked to determine if they are reflexive, symmetric, and/or transitive.
(a) The relation Ri on R is reflexive, symmetric, and transitive.
(b) The relation R on A is not reflexive, not symmetric, and transitive.
(c) The relation Rs on Z is not reflexive, not symmetric, and transitive.
(d) The relation R, on Z is not reflexive, not symmetric, and not transitive.
(e) The relation Rs on Z is reflexive, not symmetric, and transitive.
Learn more about reflexive relation on:
https://brainly.com/question/30105703
#SPJ4
Which of the following is the graph of the inverse of f(x)=2x+3
A graph of the inverse of f(x) = 2x + 3 is shown in the image attached below.
What is an inverse function?In Mathematics and Geometry, an inverse function simply refers to a type of function that is obtained by reversing the mathematical operation in a given function (f(x)).
In this exercise, you are required to determine the inverse of the function f(x). This ultimately implies that, we would have to swap (interchange) both the independent value (x-value) and dependent value (y-value) as follows;
f(x) = y = 2x + 3
x = 2y + 3
2y = x - 3
By dividing all through by 2, we have;
f⁻¹(x) = y⁻¹ = (x - 3)/3
Read more on inverse function here: brainly.com/question/14033685
#SPJ1
Calculate d2y / dx2:a)y = −5x2 + 3xd2y / dx2 = ?b)y= -5/x2d2y / dx2 = ?c)y = e−x + exd2y / dx2 = ?
The charges of the polyatomic ions listed:
- Hydroxide: OH⁻ (charge of -1)
- Carbonate: CO₃²⁻ (charge of -2)
- Sulfate: SO₄²⁻ (charge of -2)
- Ammonium: NH₄⁺ (charge of +1)
- Nitrate: NO₃⁻ (charge of -1)
What are polyatomic ions?Polyatomic ions are charged groups of atoms that behave as a single unit and carry a net electrical charge. These ions are made up of two or more atoms covalently bonded together, but they have an overall charge due to the loss or gain of one or more electrons.
Polyatomic ions are often formed from non-metal elements that share electrons in covalent bonds, and they can have either a positive or negative charge depending on the number of electrons they gain or lose. Some examples of polyatomic ions include hydroxide (OH⁻), ammonium (NH₄⁺), carbonate (CO₃²⁻), and sulfate (SO₄²⁻).
learn more about Polyatomic ions: https://brainly.com/question/30348555
#SPJ1
Under what circumstances does the binomial distribution approximate a normal distribution? a. When npq > 10
b. When pn and qn are both > 10
c. When qn > 10
d. When pn > 10
The binomial distribution approximates a normal distribution under the following circumstance: a. When npq > 10,
where n is the sample size, p is the probability of success, and q is the probability of failure. When npq > 10, the binomial distribution is approximately normal with a mean of np and a standard deviation of sqrt(npq).
Binomial distribution is a probability distribution that describes the probability of a certain number of successes in a fixed number of independent trials, each with the same probability of success. The trials can be either "success" or "failure" events, and the probability of success is denoted by p. The binomial distribution is described by two parameters: n, the number of trials, and p, the probability of success in each trial.
The probability mass function of the binomial distribution is given by the formula:
P(X = k) = (n choose k) * p^k * (1-p)^(n-k)
where X is the random variable denoting the number of successes, k is the number of successes, n is the number of trials, p is the probability of success in each trial, and (n choose k) is the binomial coefficient, which represents the number of ways to choose k successes from n trials.
Visit here to learn more about binomial distribution brainly.com/question/29137961
#SPJ11
write the following in decimal form and say what kind of decimal expansion each has5/11
Answer:
Step-by-step explanation:
5/11 = 0.45454545........
This is a repeating exxpansion that goes on without bounds.
find the area under the normal curve to the left of z plus the area under the normal curve to the right of z. the combined area is
One is the sum of the areas under the normal curves to the left and right of z.
For a normal distribution, the total area under the curve is 1. Therefore, if we can find the area to the left of z, we can subtract it from 1 to find the area to the right of z.
The area to the left of z can be found using a standard normal distribution table or a calculator. For example, if z is 1.5, the area to the left of z is 0.9332.
The area under the entire normal curve is 1. Therefore, the area to the left of z plus the area to the right of z must add up to 1.
Visually, we can think of the normal curve as being symmetric about its mean, which is located at [tex]z = 0[/tex]. As a result, the area to z's left and right are equal. Area to the left of z plus Area to the right of z equals
[tex]1/2 + 1/2 = 1[/tex] as a result.
[tex]1 - 0.9332 = 0.0668[/tex]
Therefore, the combined area is:
[tex]0.9332 + 0.0668 = 1[/tex].
This supports the notion that the entire area under the normal curve is 1.
As a result, the area under the normal curve to the left of z plus the area to the right of z together equal one.
To know more about combined area visit
https://brainly.com/question/15440654
#SPJ4
a rectangle has one side of cm. how fast is the area of the rectangle changing at the instant when the other side is cm and increasing at cm per minute? (give units.)
Let's assume that the sides of the rectangle are labeled as follows: the given side is x cm, and the other side is y cm. The area of the rectangle is given by A = xy.
We are given that the other side, y, is increasing at a rate of 4 cm/min. This means that the derivative of y with respect to time is dy/dt = 4 cm/min.
We are asked to find how fast the area is changing at the instant when y = 7 cm. To do this, we need to find the derivative of the area with respect to time:
dA/dt = d(xy)/dt
Using the product rule of differentiation, we can write:
dA/dt = x(dy/dt) + y(dx/dt)
Since x is constant, dx/dt = 0.
Substituting in the given values, we get:
dA/dt = x(dy/dt) = x(4 cm/min)
When y = 7 cm, we have x = 10 cm (since we were given that one side is cm). Therefore, at this instant:
dA/dt = 10 cm × (4 cm/min) = 40 cm²/min
So the area of the rectangle is increasing at a rate of 40 cm²/min when y = 7 cm, and the other side is increasing at a rate of 4 cm/min.
Learn more about rectangle
https://brainly.com/question/29123947
#SPJ4
What is the answer and steps
A. The p-value is less than 0.05, we reject the null hypothesis that the scores are evenly distributed. We conclude that the scores are not evenly distributed.
B. The p-value to be less than 0.05. We can conclude that there is strong evidence to suggest that the mean scores of left-handed and right-handed students are different.
How did we arrive at these assertions?a) To test whether the scores are evenly distributed, employ the Chi-squared goodness-of-fit test. Our null hypothesis is that the scores are evenly distributed, and the alternative hypothesis is that they are not evenly distributed.
Calculate the expected frequencies for each category assuming even distribution. The total frequency is 150, so, expect 30 scores in each category if the scores are evenly distributed. The expected frequencies for each category are:
0≤x≤20: 30
20<x≤40: 30
40<x≤60: 30
60<x≤80: 30
80<x≤100: 30
Then, calculate the test statistic:
χ^2 = ∑(O-E)²/E
where O is the observed frequency and E is the expected frequency.
The degrees of freedom for this test is (number of categories - 1) = 4.
Using a chi-squared distribution table with 4 degrees of freedom and a significance level of 0.05, the critical value is 9.488.
The observed values and expected values for each category are:
Score Range | Observed Frequency (O) | Expected Frequency (E) | (O-E)²/E
0≤x≤20 | 21 | 30 | 2.1
20<x≤40 | 15 | 30 | 7.5
40<x≤60 | 32 | 30 | 0.2
60<x≤80 | 39 | 30 | 3.3
80<x≤100 | 43 | 30 | 4.3
The test statistic is:
χ² = 2.1 + 7.5 + 0.2 + 3.3 + 4.3 = 17.4
The p-value for this test is the probability of getting a chi-squared value of 17.4 or higher with 4 degrees of freedom. Using a chi-squared distribution table, we find the p-value to be less than 0.01.
Since the p-value is less than 0.05, we reject the null hypothesis that the scores are evenly distributed. We conclude that the scores are not evenly distributed.
b) To test whether there is a difference between the mean scores of left-handed and right-handed students, we will use a two-sample t-test with equal variances. Our null hypothesis is that there is no difference in mean scores between left-handed and right-handed students, and the alternative hypothesis is that there is a difference.
The test statistic for the two-sample t-test is:
t = (x-bar₁ - x-bar₂) / (sₚ * √(¹/n₁ + ¹/n₂))
where x-bar₁ and x-bar₂ are the sample means, sₚ is the pooled standard deviation, n₁ and n₂ are the sample sizes, and sqrt is the square root function.
The pooled standard deviation is calculated as:
sₚ = √(((n₁ - 1) * s₁² + (n₂ - 1) * s₂²) / (n₁ + n₂ - 2))
where s₁ and s₂ are the sample standard deviations.
Plugging in the values from the question, we get:
t = (70 - 60) / (√(198/30 + 198/30)) = 2.16
Find the p-value for this test to determine whether it is statistically significant. Utilizing a t-distribution table with 58 degrees of freedom (total sample size minus 2), and a significance level of 0.05, the critical value will be 2.001.
Since the calculated t-value of 2.16 is greater than the critical value of 2.001, we can reject the null hypothesis that there is no difference in mean scores between left-handed and right-handed students. We conclude that there is a statistically significant difference between the mean scores of left-handed and right-handed students.
The p-value for this test is the probability of getting a t-value of 2.16 or higher with 58 degrees of freedom. Using a t-distribution table or calculator, the p-value is less than 0.05.
Therefore, we can conclude that there is strong evidence to suggest that the mean scores of left-handed and right-handed students are different.
learn more about p-value: https://brainly.com/question/4621112
#SPJ1
the product of 3 integers is - 804. if two integers are 4 and - 3, find the third integer
Answer:
3/49/12
This is because
3x3=9
4 x 3 = 12
3/4 = 9/12
Answer: 67
Step-by-step explanation:
Write an equation.
Product means multiplied
So 3 numbers multiplied is -804
number1 =4
number2 = -3
number3 = x
(4)(-3)(x) = -804 simplify
-12x= -804 divide both sides by -12
x=67
Use The Theorem 1. 4. 5 And Then Use The Inversion Algorithm To Find A^-1 , If It ExistsA=[a b][c d]In invertible if and only ad - bc ≠ 0, in which case the inverse is given by the formulaA-¹=1/ad/bc[d -b][-c a]a. A = [1 4][2 7]b. A = [ 2 -4][-4 8]
a.) The inverse of matrix A is [7 -4][-2 1].
b.) det(A) is zero, we know that A is not invertible.
Theorem 1.4.5 states that a matrix A is invertible if and only if its determinant, which is defined as ad-bc, is nonzero. If A is invertible, then its inverse A⁻¹ is given by the formula:
A⁻¹ = 1/det(A) * [d -b][-c a],
where det(A) = ad-bc is the determinant of A.
Now, let's use this theorem and the inversion algorithm to find the inverses of the given matrices:
a. A = [1 4][2 7]
First, we need to calculate the determinant of A:
det(A) = ad-bc = (1 * 7) - (4 * 2) = 1
Since det(A) is nonzero, we know that A is invertible. Now, we can apply the formula for A⁻¹:
A⁻¹ = 1/det(A) * [d -b][-c a]
= 1/1 * [7 -4][-2 1]
= [7 -4][-2 1]
b. A = [2 -4][-4 8]
Again, we need to calculate the determinant of A:
det(A) = ad-bc = (2 * 8) - (-4 * -4) = 0
Here the det is zero there is no invertible matrix for B.
To know more about matrix here
https://brainly.com/question/28180105
#SPJ4
The table shows the shoe size of 23 students.
A student is picked at random.
there are 2 ansers
(a) Work out the probability that the student has a school size of 8.
(b) Work out the probability that the student has a school size of 7 or smaller.
Pls help
a. The probability that the student has a shoe size of 8 is 2/23.
b. The probability that the student has a shoe size of 7 or smaller is 7/23.
To calculate the probabilities, we need to know the total number of students and the number of students with each shoe size.
Since the table is not provided, I'll assume you meant "shoe size" instead of "school size" in your question.
I'll also assume that the shoe sizes are whole numbers.
Let's assume the table contains the following information:
Shoe Size:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
(a) To work out the probability that the student has a shoe size of 8, we need to determine the number of students with a shoe size of 8 and divide it by the total number of students.
Number of students with shoe size 8: 2 (according to the table)
Total number of students: 23
Probability = Number of students with shoe size 8 / Total number of students
Probability = 2 / 23
Therefore, the probability that the student has a shoe size of 8 is 2/23.
(b) To work out the probability that the student has a shoe size of 7 or smaller, we need to determine the number of students with shoe sizes 1 to 7 and divide it by the total number of students.
Number of students with shoe sizes 1 to 7: 7 (according to the table)
Total number of students: 23
Probability = Number of students with shoe sizes 1 to 7 / Total number of students
Probability = 7 / 23
Therefore, the probability that the student has a shoe size of 7 or smaller is 7/23.
For similar question on probability.
https://brainly.com/question/30535529
#SPJ11
Question : A school has five houses A, B, C, D and E. A class has 23 students, 4 from house A, 8. from house B, 5 from house C, 2 from house 0 and rest from house E. A single student is selected at random ,to be the class monitor. The probability that the selected student is not from A, Band C is?
If a cannot = 0, then the limit, as x approaches a, [(x^2-a^2)/(x^4-a^4)] is
Answer: We can factor the numerator and denominator of the expression as the difference of squares:
(x^2 - a^2) = (x - a)(x + a)
(x^4 - a^4) = (x^2 - a^2)(x^2 + a^2)
Substituting these into the limit expression, we get:
lim x→a [(x^2-a^2)/(x^4-a^4)]
= lim x→a [(x - a)(x + a) / (x^2 - a^2)(x^2 + a^2)]
We can simplify this expression by canceling out the common factor of (x - a) in the numerator and denominator:
lim x→a [(x + a) / (x^2 + a^2)]
Now, we can evaluate the limit by direct substitution, since the expression is continuous at x=a:
lim x→a [(x + a) / (x^2 + a^2)] = (a + a) / (a^2 + a^2) = 2a / 2a^2 = 1/a
Therefore, the limit of [(x^2-a^2)/(x^4-a^4)] as x approaches a (where a cannot equal 0) is 1/a.
18) Which workplace climate best encourages employee responsibility?
Question 18 options:
Common goals encourage employees to work together rather than compete against each other.
Employees have a sense of ownership, and the employer delegates his authority.
Hard work and achievements are recognized then used as an employee motivator.
Objectives are clearly defined, and goals help motivate employees to complete tasks.
A workplace climate that encourages employee responsibility is one in which employees feel a sense of ownership and empowerment in their work. So, correct option is B.
This can be achieved in several ways, including setting clear objectives and goals, recognizing hard work and achievements, and encouraging teamwork and collaboration. When employees feel that they are a valued and integral part of the organization, they are more likely to take responsibility for their work and strive to achieve success.
One way to foster a sense of responsibility is to delegate authority to employees, giving them more control over their work and decision-making processes. This allows employees to take ownership of their work and feel empowered to make a positive impact on the organization.
When employees feel that their contributions are recognized and valued, they are more likely to take responsibility for their work and strive to achieve success.
Another way to encourage employee responsibility is to establish a culture of teamwork and collaboration. By working together towards common goals, employees are more likely to feel a sense of responsibility to their colleagues and the organization as a whole.
When employees are motivated by a sense of camaraderie and shared purpose, they are more likely to take ownership of their work and strive to achieve success.
So, correct option is B.
To learn more about workplace click on,
https://brainly.com/question/30584226
#SPJ1
What is the approximate volume of a cone with a height of 6 mm and radius of 18 mm? use 3. 14 to approximate pi, and express your final answer to the nearest hundredth. Enter your answer as a decimal in the box. Mm³.
Answer:
2034.70 mm³
Step-by-step explanation:
Given:
radius = 18mm
height = 6mm
pi = 3.14
volume of a cone is computed by multiplying pi, radius raised to the 2nd power, and height, which has been divided by 3.
v = πr²h/3
v = 3.14 * (18mm)² x 6mm/3
v = 3.14 * 324mm² x 2mm
v = 2034.72 mm³
volume rounded to the nearest tenth would be 2034.70 mm³
the lpga conducts a study in which they use a simple random sample of 900 golfers. they examine the data from the sample and calculate that 37% of them own golf clubs made in the usa. the 37% is the . group of answer choices confidence level population parameter sample statistic confidence interval
The correct option is "sample statistic." A sample statistic is a numerical summary of a sample. In this case, the sample statistic is the percentage of golfers in the sample who own golf clubs made in the USA, which is 37%.
The population parameter is the true value of a characteristic of the entire population, which is often unknown and estimated based on the sample data. In this case, the population parameter would be the percentage of all golfers who own golf clubs made in the USA, which we do not know based on the information given.
A confidence level is a measure of the uncertainty associated with statistical inference, such as a confidence interval. It is often expressed as a percentage, such as 95% or 99%. However, no confidence level is mentioned in the question.
A confidence interval is a range of values that is likely to contain the true value of a population parameter, based on the sample data and a specified level of confidence. Again, no confidence interval is mentioned in the question.
Learn more about sample statistic, here:
brainly.com/question/15840694
#SPJ11
