About 96.17% of the students who took the test earned a 70 points or higher
What is an equation?An equation is an expression composed of variables and numbers linked together by mathematical operations.
The z score of a normal distribution is given by:
z = (raw score - mean)/standard deviation
The average test score from the last year's class was 85 points with a standard deviation of 9. Hence:
Mean = 85, standard deviation = 9
For a score of 70 points or higher:
z = (70 - 85) / 9 = -1.67
P(z > -1.67) = 1 - P(z < -1.67) = 1 - 0.0383 = 0.9617 = 96.17%
96.17% of the students earned a 70 points or higher
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solve the given initial-value problem. d2x dt2 + ω2x = f0 sin ωt, x(0) = 0, x '(0) = 0
The solution to the given initial-value problem is x(t) = c1(e-ωt - eωt) = 2c1 sin ωt
The given initial-value problem is a second-order differential equation: d2x dt2 + ω2x = f0 sin ωt, x(0) = 0, x '(0) = 0
First, we can solve the homogeneous equation d2x dt2 + ω2x = 0 using the method of characteristic equation. The characteristic equation is r2 + ω2 = 0, which has two solutions r1 = -ω, r2 = ω.
The general solution to the homogeneous equation can be expressed as:
x(t) = c1e-ωt + c2eωt
Next, we can solve the non-homogeneous equation d2x dt2 + ω2x = f0 sin ωt. Since the right-hand side of the non-homogeneous equation has a sinusoidal form, we can use the method of variation of parameters to solve it.
The particular solution can be expressed as:
x(t) = A sin ωt + B cos ωt
By substituting the initial conditions, we can get:
A = 0, B = 0
Therefore, the solution to the given initial-value problem is:
x(t) = c1e-ωt + c2eωt
The constant c1 and c2 can be determined by the initial conditions:
x(0) = c1 + c2 = 0
x'(0) = -ωc1 + ωc2 = 0
Therefore, c1 = -c2 and c1 + c2 = 0.
Hence, the solution to the given initial-value problem is:
x(t) = c1(e-ωt - eωt) = 2c1 sin ωt
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The dimensions for a rectangular prism are x+5 for the length, x+1 for the width, and x for the height. What is the volume of the prism?
The volume of this rectangular prism is (x+5) * (x+1) * x = x^3 + 6x^2 + 6x + 5.
Rectangular Prism:
A rectangular prism is a three-dimensional shape, that has six faces (two at the top and bottom and four lateral faces). All the faces of the prism are rectangular in shape. Hence, there are three pairs of identical faces here.
The Volume of a Rectangular Prism Formula is,
The volume of a Rectangular Prism (V) = l × b × h
Where,
“b” is the base length of the rectangular prism
“l” is the base width of the rectangular prism
“h” is the height of the rectangular prism
The formula for the volume of a rectangular prism is length x width x height. So, the volume of this rectangular prism is (x+5) * (x+1) * x = x^3 + 6x^2 + 6x + 5.
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students majoring in psychology surveyed 200 of their fellow students about their dreams. the results of the survey are shown in the venn diagram. let b be the event that the participant dreams in black and white and let c be the event that the participant dreams in color. a venn diagram titled student dreams. one circle is labeled b, 4, the other circle is labeled c, 10, the shared area is labeled 12, and the outside area is labeled 174. what is the probability that a randomly selected participant dreams in black and white or color? 0.06 0.07 0.13 0.26
The probability that a randomly selected participant dreams in black and white or color is 0.01
The probability that a randomly selected participant dreams in black and white or color is the sum of the probabilities of the individual events (dreaming in black and white or dreaming in color) and the probability of the intersection of the two events (dreaming in both black and white and color).
The probability of dreaming in black and white is the number of participants who dream in black and white divided by the total number of participants surveyed:
P(b) = 4/200
The probability of dreaming in color is the number of participants who dream in color divided by the total number of participants surveyed:
P(c) = 10/200
The probability of dreaming in both black and white and color is the number of participants who dream in both black and white and color divided by the total number of participants surveyed:
P(b ∩ c) = 12/200
The probability of dreaming in black and white or color is the sum of the individual probabilities and the intersection probability:
P(b ∪ c) = P(b) + P(c) - P(b ∩ c) = 4/200 + 10/200 - 12/200 = 2/200 = 1/100
The probability that a randomly selected participant dreams in black and white or color is 1/100.
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Last year, Christine had $20,000 to invest. She invested some of it in an account that paid 8% simple interest per year, and she invested the rest in an account that paid 10% simple interest per year. After one year, she received a total of $1920 in interest. How much did she invest in each account?
First account:
Second account:
I WILL MARK IT BRAINLIEST
If Last year, Christine had $20,000 to invest. The amount that she invest in each account is First account $16,000 and Second account: $4,000.
How to find the amount invested ?Let x represent the amount Christine invested in an account that paid 8% interest
Let y represent the amount Christine invested in an account that paid 10% interest
x + y = 20,000
.8x + .010y = 1920
Multiply each sides of this equation by 100 to remove the decimal points.
8x + 10y = 192,000
8(20,000-y) + 10y = 192,000
160,000 - 8y + 10y = 192,000
2y = 32,000
y = 32,000/2
y = $16,000
So,
x = 20,000 - 16,000
x = $4000
Therefore the First account is $16,000 and Second account is $4,000.
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a survey company that wants to know the views of the average person sends an agent to a shopping mall to interview anyone who is available. the people who are interviewed constitute a
The people who are interviewed constitute a convenience sample.
If the survey company is interviewing anyone who is available in the shopping mall without using any systematic method for selecting the participants, it would be considered a convenience sample.
In a convenience sample, the sample is selected based on ease of access to the participants, and it may not be representative of the entire population. This type of sampling can lead to bias in the sample, as the views of people who happen to be available in the mall at the time may not be representative of the views of the entire population.
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All changes saved
1. A store offers a discount of 40% off any one regular-price item. The price paid after this discount is represented by s(2). Employees also receive 10% off any purchases; the price paid after this discount is
represented by e(z). Which of the following represents the composite function of applying the employee discount first, and the store discount second?
Oe(s(z)=0.04z
Oe(s(z))=0.54z
Os(e(z))=0.54z
Os(e(z)) = 0.04z
A function that depends on another function is referred to as a composite function.
What is composite function?A function that depends on another function is referred to as a composite function. When one function is inserted into another, a composite function is produced. For instance, f(g(x)) is the composite function created when x in f is replaced with g(x) (x). You can interpret f(g(x)) as "f of g of x." Replace the rightmost function with the middle function, then this with the leftmost function to find a composite function made up of three functions. For instance, if g(x)=x2, f(x)=3x+1, and h(x)=1/x, h(g(f(x))=1/(3x+1)2 is the result.Let's say the price of an item is $1
Scenario #1 - 40% off $1 = 40 cents OFF
The discounted price = 60 cents
Now the 10% off of 60 cents
60-6 = 54 cents.
Scenario #2 - 10% of $1
The discounted price = 10 cents
100(cents) - 10 = 90 cents
Now the 40% off of 90 cents
90-36 = 54 cents
Let's try another value to confirm
Let's say the price of an item is $2
Scenario #1 - 40% off $2 = 80 cents OFF
200-80= 120 = $1.20
Now the 10% off of $1.20
120-12= 108 = $1.08
Scenario #2 - 10% off $2 = 20 cents OFF
200-20 = 180= 1.80
Now the 40% off of $1.80
180-72 = 108 = 1.08
The complete question is,
A store offers a discount of 40 off any one regular-priced item. employees also get 10% off any purchases. in which order should the discounts apply so that the employee pays the least amount?
A. Employee discount then store discount
B. They are both the same
C. Store discount then employee discount
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Can a right triangle with side 6 cm 10 cm and 8cm be formed give reason?
Yes , a right triangle with the given sides 6 cm 10 cm and 8cm can be formed because the sides satisfies the Pythagoras Theorem .
According to Pythagoras Theorem , the square of the hypotnuse of triangle is equal to the square of the other two sides of triangle ;
The sides of the triangle are given as : 6cm ,10cm and 8cm ;
which means that ,
the hypotnuse is = 10 cm ;
According to Pythagoras Theorem ;
⇒ [tex]10^{2} =8^{2} +6^{2}[/tex] ;
⇒ [tex]100 = 64 + 36[/tex] ;
⇒ [tex]100= 100[/tex] ;
the side satisfies the condition to form the right triangle .
Therefore , the given sides forms a Right Triangle .
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B C= 16 c m, and is the diameter of the circle,A B CDis a rectangle, a section A B is 12 taller thanB C.
Determine the areaSfor the given figure!
In the calculations, it is assumed thatπ≈ 3!
Area of a semicircle S1 =
Area of the figure S =
We should be aware that if a circle encircles a rectangle, its diameter is equal to the diagonal of the rectangle, where 2r is the reciprocal of the diagonal. AB = 8cm ; BC = 6.5 cm.
Determine the area ?We should be aware that if a circle encircles a rectangle, its diameter is equal to the diagonal of the rectangle, where 2r is the reciprocal of the diagonal.
The formula for calculating the area of a circle is [pi r 2], which we should keep in mind. With respect to a rectangle, there is only one such circle.The Pythagorean theorem states that the diagonal of a rectangle with sides lengths a and b is equal to a2 + b2.
The radius is simply a2+b22 since the diagonal has a diameter.Keep this response on hand.
BC = x- 1.5
x * (x-1.5) = 52
x^2 - 1.5x - 52 = 0
Discriminant = 2.25 -4(-52) = 2.25 + 208 = 210.25
We are searching only positive value
(1.5 + 14.5)/2 = 16 / 2 = 8 cm
AB = 8 cm
BC = 8 - 1.5 = 6.5 cm
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How do you know if two ratios are proportional?
Answer: Ratios are proportional if they represent the same relationship.
Step-by-step explanation:
One way to see if two ratios are proportional is to write them as fractions and then reduce them. If the reduced fractions are the same, your ratios are proportional.
What is an example of one solution?
A food pantry is a solution to food insecurity, where people can donate non-perishable food items for those in need.
One possible solution to the problem of food insecurity is to start a food pantry. A food pantry is a place where people can donate non-perishable food items for those in need. These items can include canned goods, boxed goods, and non-perishable items. People can then come to the pantry and take what they need. This helps to ensure that people in the community have access to the food they need.
A food pantry is a solution to food insecurity, where people can donate non-perishable food items for those in need. People can come to the pantry and take what they need, providing access to food for those in the community.
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Which equations can be used to solve for y, the length of the room? Select three options. y(y + 5) = 750 y2 – 5y = 750 750 – y(y – 5) = 0 y(y – 5) + 750 = 0 (y + 25)(y – 30) = 0
Answer:
y^2 + 5y - 750 = 0
y(y + 5) = 750
750 - y(y - 5) = 0
Step-by-step explanation:
Car rental company A charges a set fee of $75 for the week plus an additional $0.07 per mile driven. Car rental company B shares a set fee of $100 for the week plus an additional $0.03 per mile driven. When would the two car companies cost you the same amount of money?
Equating the total costs of the two rental companies, they would cost the same amount after 625 driving miles.
What is an equation?An equation is a mathematical statement that claims that two or more mathematical expressions are equivalent or equal.
Equations use the equation symbol (=) to depict the equality of the expressions.
Company A Company B
Fixed rental charge $75 $100
Rental charge per mile $0.07 $0.03
Let the number of miles driven = m
Equations:Total cost of Company A's rental = 75 + 0.07m
Total cost of Company B's rental = 100 + 0.03m
For the cost to be the same, 75 + 0.07m = 100 + 0.03m.
Solving for m:
75 + 0.07m = 100 + 0.03m
0.07m - 0.03m = 100 - 75
0.04m = 25
m = 625
Thus, for the two car companies' rental cost to be the same amount, one would rent a car for 625 miles.
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n the diagram, four circles of radius 1 with centres $P$, $Q$, $R$, and $S$ are tangent to one another and to the sides of $\triangle ABC$, as shown. The radius of the circle with center $R$ is decreased so that the circle with center $R$ remains tangent to $BC$, the circle with center $R$ remains tangent to the other three circles, and the circle with center $P$ becomes tangent to the other three circles. The radii and tangencies of the other three circles stay the same. This changes the size and shape of $\triangle ABC$. $r$ is the new radius of the circle with center $R$. $r$ is of the form $\frac{a \sqrt{b}}{c}$. Find $a b c$.
On solving the provided question we can say that so the value of triangle - y + Z = 1+ r = > 1 -r +
What is triangle?A triangle is a polygon since it has three sides and three vertices. It is one of the basic geometric shapes. The name given to a triangle containing the vertices A, B, and C is Triangle ABC. A unique plane and triangle in Euclidean geometry are discovered when the three points are not collinear. Three sides and three corners define a triangle as a polygon. The triangle's corners are defined as the locations where the three sides converge. 180 degrees is the result of multiplying three triangle angles.
Here,
in triangle
by construction = y0 = r - 1
Pythagoras = x² + y²
=> (1+r)² = x
=> x = √(1+r)² - (1-r)²
Pythagoras = x² + z² = 2²
=> z =√4-4r
so the value of triangle -
=> y + Z = 1+ r
=> 1 -r + 2√1 -r1 =
=> r = -1 + √5/2
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The complete question is "In the diagram, four circles of radius 1 with centres P, Q, R, and S are tangent to one another and to the sides of triangle ABC, as shown."
An aquarium holds 8. 6 cubic feet of water. The aquarium is filled up further to hold 9. 2 cubic feet of water. What is the percent of change for the volume of water inside the aquarium?
The per cent of change for the volume of water inside the aquarium is 93.5.
An aquarium carries 8.6 cubic feet of water.
The aquarium is loaded up further to hold 9.2 cubic feet of water.
We have to find the per cent of change for the volume of water inside the aquarium.
A ratio or value that may be stated as a fraction of 100 is a percentage. If we calculate a percentage of a number, we should divide it by its entirety and then multiply it by 100.
The per cent of change for the volume of water inside the aquarium = Water holds by aquarium/Further filled water × 100
The per cent of change for the volume of water inside the aquarium = (8.6/9.2) × 100
The per cent of change for the volume of water inside the aquarium = 93.5%.
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Fwam and his children went into a bakery and will buy cupcakes and brownies. Each cupcake costs $4.50 and each brownie costs $1.75. Fwam has a total of $50 to spend on cupcakes and brownies. Write an inequality that would represent the possible values for the number of cupcakes purchased, c, and the number of brownies purchased, b.
The number of cupcakes and brownies Fwam could have purchased is 1.75b + 4.50c ≤50.
What is inequality?The word "inequality" is used in mathematics to refer to expressions that relate variables (for example the prices of different products) using symbols that are different from =, which is used in equations. Due to this, inequalities might have numbers, letters representing variables, and symbols such as ≤, <, >.
How to write the inequality in this situation?1. List the variables
b = cupcakes
c = brownies
4.50 = price of the cupcakes
1.75 = price of the brownies
50 = total money
2. Relate the variables
1.75b + 4.50c ≤50
Each product should be multiplied by its price
The total money can be equal to or less than 50 (≤)
The products should be added
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What is the topic in Grade 7 math?
Grade 7 maths includes integers, shapes, and symmetry etc. that is incorporated with the earlier study of previous grades.
Grade 7 math covers many topics, including: number sense and operations, geometry, data analysis, probability and statistics, expressions and equations, and problem solving. Number sense and operations involves understanding the properties of integers, rational numbers, and real numbers, and how to use them in operations and equations. Geometry focuses on understanding the properties of shapes and angles, and how to measure, construct, and classify them. Data analysis involves collecting, organizing, and interpreting data, as well as understanding the concept of probability. Expressions and equations involves solving equations and manipulating algebraic expressions. Finally, problem solving involves using the knowledge from all of the topics to solve real-world problems. Grade 7 math builds on the fundamentals learned in earlier grades, and is essential for success in math classes in the future.
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while traveling to europe, phelan exchanged 250 us dollars for euros. he spent 150 euros on his trip. after returning to the united states he converts his money back to us dollars. how much of the original 250 us dollars does phelan now have? round to the nearest cent. 1 european euro
Phelan now has 81.48 x 1.08 = 87.79 US dollars, which is 87.79 dollars of the original 250 dollars.
First, we need to find out how many euros Phelan has left after spending 150 euros on his trip.
We are taking the exchange rate of 1 euro = 1.08 USD
He started with 250 US dollars, which he exchanged for 250 / 1.08 = 231.48 euros.
After spending 150 euros, he has 231.48 - 150 = 81.48 euros left.
To convert the euros back to US dollars, we need to multiply the number of euros by the exchange rate (1 US dollar = 1.08 euros)
So, Phelan now has 81.48 x 1.08 = 87.79 US dollars, which is 87.79 dollars of the original 250 dollars.
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What's the percentage of 6 by 5 ?
Answer:
0.3
Step-by-step explanation:
Were you asking for 5% of 6? Because then you would just multiply 6 by 0.05 (because percents are always out of 100%, so converted to decimal it is out of 1) and then get 0.3
Answer: The percentage of 6 by 5 (i.e. 6:5) is 120
Step-by-step explanation:
Given: 6 by 5 i.e. 6/5
Solution: (value/ total value)* 100
hence, (6/5)*100
=1.2*100
=120.
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-2x - 3y = 8
5x + y = 6
Step-by-step explanation:
what is the question ?
solve for x and y ?
multiply the second equation by 3 and add that result to the first equation. then solve for x. then pick any original equation and solve for y.
-2x - 3y = 8
15x + 3y = 18
-----------------------
13x 0 = 26
x = 26/13 = 2
5×2 + y = 6
10 + y = 6
y = -4
Q1.Which of following is not a polynomial?
a)x^3+√3x+5 b)x^3+√2x+6 c)x^2-3x+2 d)(x-1) (x+1)
Q2. If x/y + y/x= -1 (x,y isn't zero), then value of x^3-y^3
a)1 b)-1 c)0 d)1/2
Q3.One of factors of (25x^2-1)+(1+5x^2) is-
a)5+x b)5-x c)5x-1 d)10x
To make the polynomial monic, divide even by leading term first.
Then, in order to create an equation even without linear element, replace x = y a12 for the supplied values of x2 + a1x + a0.
A monic polynomial is what?A monic polynomial in algebra is a univariate polynomial with a single variable and a leading coefficient of 1. Its leading coefficient is the highest degree nonzero coefficient.
x3=y3 and y2=x2+xy+y2.
Finding a common denominator allows us to determine that x2 + y2 + xy=1 if xy+yx=1.
By multiplying by xy:
x2+y2=−xy
move every term to the left:
x2+xy+y2=0
Consequently, x3y3=(xy)(x2+xy+y2)=(xy)
x/y+y/x+1=0
=>(x²+y²+xy)/xy=0/1
=>x²+xy+ y²=0——(1)
Now, Since,x³-y³=(x-y)(x²+xy+y²)
=>x³ -y³=(x-y)(0). [from equation (1)]
=>x³ -y³=0,Ans.
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(1.1: geometry) suppose we want to express the point (2,3) in r2 as the solution space of a system of linear equations. (a) what is the smallest number of equations you would need? write down such a system. (b) can you add one more equation to the system in (a) so that the new system still has the unique solution (2,3)? (c) what is the maximum number of distinct equations you can add to your system in (a) to still maintain the unique solution (2,3)? (d) is there a general form for the equations in (c)?
(a) A system of two equations, x=2 and y=3, is needed to express (2,3) in R2. (b) No, only two equations can express (2,3) in R2. (c) The maximum number of distinct equations that can be added is three. (d) Yes, the general form for the equations is x-2=0, y-3=0, and z=0.
(a) The smallest number of equations you would need is two. The system of linear equations would be:
x + 2y = 6
2x + 4y = 12
(b) Yes, you can add one more equation to the system in (a) so that the new system still has the unique solution (2,3). The equation would be:
3x + 6y = 18
(c) The maximum number of distinct equations you can add to your system in (a) to still maintain the unique solution (2,3) is three. The equations would be:
x + 2y = 6
2x + 4y = 12
3x + 6y = 18
(d) Yes, there is a general form for the equations in (c). The general form is:
ax + by = c, where a, b, and c are constants.
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Créate a model to represent (a+b)
To create a model to represent (a+b), you could use a mathematical equation such as y = a + b.
What is the model about?Using mathematical concepts and terminology, a mathematical model is an abstract description of a concrete system. To make a forecast or offer insight, mathematical modeling is the act of generating a mathematical representation of a real-world phenomenon.
An equation set and a set of variables that define relationships between the variables make up a mathematical model, which often explains a system. There are numerous types of variables, including texts, boolean values, real or integer numbers, and more.
In this case, the equation y = a + b can be used. This equation represents a linear model where y is the dependent variable and a and b are the independent variables.
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99.99, 99.09, 99.091 leash to greatest
The total area of the two triangles is _____ square inches.Numerical Answers Expected!Answer for Blank 1:
The total area of the two triangles is 28 square inches.
Step 1: Calculate the area of the first triangle.
The first triangle is a right triangle with a base of 4 inches and a height of 3 inches.
Area of a triangle = (1/2) * Base * Height
Area of the first triangle = (1/2) * 4 * 3 = 6 square inches.
Step 2: Calculate the area of the second triangle.
The second triangle is an isosceles triangle with a base of 4 inches and a height of 4 inches.
Area of a triangle = (1/2) * Base * Height
Area of the second triangle = (1/2) * 4 * 4 = 8 square inches.
Step 3: Add the areas of the two triangles.
Total area = 6 + 8 = 14 square inches.
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Aiden measured a line to be 4.1 inches long. If the actual length of the line is 5.3 inches, then what was the percent error of the measurement, to the nearest tenth of a percent?
Answer:
22.6%.
Step-by-step explanation:
To calculate the percent error of a measurement, you can use the following formula:
Percent Error = (|measured value - actual value| / actual value) x 100%
Plugging in the values from the problem:
Percent Error = (|4.1 inches - 5.3 inches| / 5.3 inches) x 100% = (1.2 inches / 5.3 inches) x 100% = 0.226 x 100% = 22.6%
To the nearest tenth of a percent, the percent error is 22.6%.
Joaquin is getting a new locker at school and the first thing he must do is decide on a new combination. The three number locker combination can be selected from the numbers 0 through 21.How many different locker combinations can Joaquin choose if none of the numbers can be repeated?With your understanding of permutations, combinations, and factorials, decide if the name "combination lock" is appropriate.How many mathematical combinations are possible?:How many choices would there be if you could repeat a number, but not use the same number twice in a row?
Joaquin would have 9, 612 different locker combinations if he could repeat a number, but not use the same number twice in a row.
What is the combination?
In simple words, combination involves the selection of objects or things out of a larger group where order doesn't matter. The formula for combination helps to find the number of possible combinations that can be obtained by taking a subset of items from a larger set.
If none of the numbers can be repeated, Joaquin can choose from a total of 22 numbers (0 through 21), and he needs to select three of them for his locker combination. This is a classic example of a combination problem, as the order in which he chooses the numbers does not matter. The number of ways to choose three numbers from a set of 22 without repetition is given by the formula for combinations:
C(22,3) = 22! / (3!(22-3)!) = 222120/(321) = 2310
So, Joaquin can choose from 2310 different locker combinations if none of the numbers can be repeated.
The name "combination lock" is appropriate because it refers to the process of combining numbers in a specific order to open the lock. In this case, the order of the numbers selected does not matter.
If Joaquin could repeat a number, but not use the same number twice in a row, the number of mathematical combinations are possible is given by the formula for permutations:
A(22,3) = 222120 = 9, 612
Hence, Joaquin would have 9, 612 different locker combinations if he could repeat a number, but not use the same number twice in a row.
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please help i don't know this.
Answer:
it is you just find the total of the 29 mgs
What should be the measure of ZDAB be
so that AD || BC?
47°
A
43°
90°
B
D
Answer: [tex]90^{\circ}[/tex]
Step-by-step explanation:
By the converse of the alternate interior angles theorem, we need [tex]\angle CBA \cong \angle BAD[/tex].
Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 366.67 b 373.33 с 333.33 d 350 e 379.15
For keyboard navigation, use the up/down arrow keys to select an answer is (b) 373.33
What is keyboard navigation to select an answer?By letting users know where they are while they use the keyboard to browse a page, keyboard focus aids keyboard accessibility. Even those who have trouble using a touchpad or mouse can use a computer thanks to keyboard navigation.
The sequence in which interactive objects acquire keyboard focus is crucial for keyboard users navigating the page. The order of the keyboard navigation must be reasonable and obvious by default. This typically means that it moves from left to right and from top to bottom of the page.
This typically means that the header appears first, followed by the main navigation, page navigation, and finally the footer. The web page's source code determines this navigation order as well as the reading order for screen readers.
For keyboard navigation, use the up/down arrow keys to select an answer is (b) 373.33
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At a research facility that designs rocket engines, researchers know that some engines fail to ignite as a result of fuel system error. From a random sample of 40 engines of one design, 14 failed to ignite as a result of fuel system error. From a random sample of 30 engines of a second design, 9 failed to ignite as a result of fuel system error. The researchers want to estimate the difference in the proportion of engine failures for the two designs. Which of the following is the most appropriate method to create the estimate
It is solved using the concept of z-table. Correct option is: (E)
What is z-table?The difference from the mean is expressed as a z-score in standard deviation units. It is not clear either one agree or disagree with the null hypothesis. The likelihood that a point as severe as their statistic would be seen that under null hypothesis is known as the p-value.
A z-table, sometimes referred to as the standard normal table, gives the area beneath the curve to the left of a z-score. This region indicates the likelihood that z-values will fall inside a particular area of the standard normal distribution.
Here, we have to calculate the confidence interval for determine the population interval.
Now, P₁ - P₂, this is the difference between the two population proportion.
thus, option (E) is the correct answer.
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The complete question is as follows:
