You and your friend are standing back-to-back. Your friend runs 20 feet forward and then 15 feet right. At the same time, you run 12 feet forward and then 9 feet right. You stop and throw a baseball to your friend, who catches it. How far did you throw the baseball?

Answers

Answer 1

Answer:

40 ft

Step-by-step explanation:

the starting point is like the origin on the coordinate grid.

let's say forward for your friends is the positive y direction, and right for your friend is positive x direction.

the end point coordinates of your friend are then

(15, 20)

forward for you (facing in the other direction) is the the negative y direction. and going right for you is then actually going in the negative x direction.

your end point is therefore

(-9, -12)

the distance between both points is then per Pythagoras (and the derived distance formula) :

distance² = (x1 - x2)² + (y1 - y2)² =

= (15 - -9)² + (20 - -12)² = 24² + 32² =

= 576 + 1024 = 1600

distance = 40 ft


Related Questions

The following data set represents the population growth or decay in the past 5 years.
Year Population
2001 6,169,683,257
2002 6,248,055,839
2003 6,325,991,838
2004 6,403,480,654
2005 6,480,500,311
Determine which value is the independent value and the dependant value. Create a set of ordered pairs for the
relation. Graph the relation on a scatter plot, and make sure to label each axis.

Answers

In this data set, the year is the independent variable, and the population is the dependent variable. The population depends on the year in which it is measured.

How to create the ordered pairs

The set of ordered pairs for the relation between year and population is:

{(2001, 6,169,683,257), (2002, 6,248,055,839), (2003, 6,325,991,838), (2004, 6,403,480,654), (2005, 6,480,500,311)}

To graph this relation on a scatter plot, we can plot the year on the x-axis and the population on the y-axis. We can label the x-axis as "Year" and the y-axis as "Population (in billions)".

Here is the scatter plot of the relation:

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suppose that prior to conducting a coin-flipping experiment, we suspect that the coin is fair. how many times would we have to flip the coin in order to obtain a 98% confidence interval of width of at most .15 for the probability of flipping a head? (note that the z-score was rounded to three decimal places in the calculation) a) 241 b) 185 c) 238 d) 188 e) 247 f) none of the above

Answers

The minimum number of coin flips required to obtain a 98% confidence interval width of at most 0.15 is 188.

Hence option d is correct.

We'll use the formula for the confidence interval of a proportion, which is given by:
CI = p-hat ± (z * sqrt(p-hat * (1-p-hat) / n))
Here, p-hat represents the sample proportion (observed proportion of heads), z is the z-score for the desired confidence level (98% in this case), and n is the number of coin flips.
We want to find the minimum number of coin flips (n) needed to obtain a confidence interval width of at most 0.15. Since we suspect that the coin is fair, we'll assume p-hat = 0.5.
For a 98% confidence interval, the z-score (rounded to three decimal places) is 2.576.

Now, we'll set up the inequality:
0.15 >[tex]= 2 * (2.576 * \sqrt{(0.5 * (1-0.5) / n))}[/tex]
Squaring both sides and solving for n, we get:
n >= [tex]((2.576 * \sqrt{(0.25))^2) / (0.15/2)^2}[/tex]
n >= 188.423
Since the number of coin flips must be a whole number, we'll round up to the nearest integer, which is 188.

Hence option d is correct.

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the applet is selecting random samples from the town's population this year. what do we assume is true about this population of babies?

Answers

When the applet selects random samples from the town's population of babies, we assume that the population is large enough and diverse enough to accurately represent the characteristics and traits of the entire population.

We assume that the selection of the random samples is unbiased and that every member of the population has an equal chance of being selected for the sample.

Based on your question, we are discussing random samples taken from a town's population of babies this year. When selecting random samples from this population, we assume the following:

1. The population of babies is well-defined and includes all babies born in the town within the specified year.
2. The random samples are representative of the entire population, meaning that each baby has an equal chance of being selected in the sample.
3. The samples are independent, meaning that the selection of one baby does not influence the selection of another.

These assumptions ensure that the results obtained from the random samples can be generalized to the entire population of babies in the town for this year.

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By assuming these conditions are met, we can perform statistical analyses on the random samples and make valid inferences about the entire population of babies in the town.

When an applet is selecting random samples from a town's population of babies this year, we typically assume the following about the population:
Independence:

Each baby selected in the sample is independent of the others, meaning that the outcome of one selection does not affect the outcome of another selection.
Randomness:

The applet chooses babies from the population in a random manner, ensuring that every baby has an equal chance of being selected.

Representativeness:

The random samples selected are representative of the entire population, meaning that the samples accurately reflect the characteristics of the town's population of babies as a whole.

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a prism has three rectangular faces. its other faces are in the shape of

Answers

Answer: All the faces are rectangular.

Step-by-step explanation: A prism with three rectangular faces is called a rectangular prism. Therefore, the other faces are in the shape of rectangles.

an x(bar) chart has a center line of 100, uses three-sigma control limits, and is based on a sample size of four. the process standard deviation is known to be six. if the process mean shifts from 100 to 92, what is the probability of detecting this shift on the first sample following the shift?

Answers

The probability of detecting this shift on the first sample following the shift would be 68.3%.

The probability of detecting can be calculated by taking the difference between the sample mean and the new process mean (92-100 = -8) and dividing it by the process standard deviation (6).

The result is -1.33, which is then used to calculate the probability of a sample mean falling within the three-sigma control limits.

The difference between the sample mean and the new process mean (92-100 = -8).

The difference by the process standard deviation (6).

The result is -1.33.

The number to calculate the probability of a sample mean falling within the three-sigma control limits.

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2. Find the area of the circle. Use 3.14 for r. Round to the nearest unit.
18 cm
01,017 cm²
0254 cm²
057 cm²
028 cm²
(1 point)

Answers

The area of the circle for given problem will be approx. 254 [tex]cm^2[/tex].

How to find the area of circle?

The formula for finding the area of a circle is given by:

Area =[tex]\pi* r^2[/tex]

where "π" (pi) is a mathematical constant approximately equal to 3.14159, and "r" represents the radius of the circle.

Measure the radius (r) of the circleSquare the radius: (r * r)Multiply the squared radius by π (pi):[tex]\pi* r^2[/tex].The result is the area of the circle.

Given,

Find the radius (r) of the circle. The radius is half of the diameter, so divide the diameter by 2:

Radius (r) = Diameter / 2 = 18 cm / 2 = 9 cm

Area = [tex]\pi * r^2[/tex] = [tex]3.14*(9 \;cm)^2[/tex] = [tex]254.34 \;cm^2[/tex] (rounded to two decimal places)

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Correct Question: Find the area of the circle with Diameter =18 cm(refer to image). Use 3.14 for π.( Round to the nearest unit).

The angle of elevation from point A to the top of a hill is 49°. If point A is 400 feet from the base of the hill, how high is the hill? Round to the nearest tenth.

1. 460.1 ft
2. 301.9 ft
3. 262.4 ft
4. 459.3 ft​​​

Answers

The height of the hill in the triangle is approximately 460.1 feet, which corresponds to option 1.

What is angle of elevation?

Angles are used to define how an object is situated in respect to an observer. These angles include the angle of elevation and the angle of depression. The angle of elevation is the angle formed between the horizontal and a line connecting an item above eye level and the observer. In other words, it is the angle created while gazing up at an item from the ground. On the other hand, the angle of depression is the angle formed by the horizontal and a line drawn from the observer to an object that is below their level.

For the given triangle, applying the trigonometric function we have:

tan(49°) = h / 400

h = 400 * tan(49°) ≈ 460.1 ft

Hence, the height of the hill is approximately 460.1 feet, which corresponds to option 1.

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I need some help please

Answers

Answer: it is 3/2x x + 0

Step-by-step explanation:

you do rise over run which is 3 up and 2 over in this case. and the 0 is the y intercept but its at the center also known as the origin so its 0

Answer:

Step-by-step explanation:

Please answer the question in the pdf. I just need the values for A, B, and C. I am offering 15 points. Thanks.

Answers

Recall the equation provided in the pdf:

   (125x ^ 3 * y ^ - 12) ^ (- 2/3) = (y ^ [A])/([B] * x ^ [c])

find A B and C.

The answer will be:

A = 8/3B = 3/4C = 8/3

Checkout the calculation of the exponential

We can solve this problem using the rules of exponents and algebraic manipulation.

Starting with the left-hand side of the equation:

(125x^3 * y^-12)^(-2/3)

Using the rule that (a * b)^c = a^c * b^c, we can rewrite the expression as:

125^(-2/3) * x^(-2) * y^(8)

Simplifying further, we can use the fact that a^(-n) = 1/(a^n) to get:

1/(5^2 * x^2 * y^8/3)

Now, we can see that the denominator on the right-hand side of the equation must be 5^2 * x^2 * y^8/3. To find the numerator, we need to simplify the expression y^A. Comparing exponents, we see that:

y^A = y^(8/3)

Therefore, we need to find a value of A such that A = 8/3. Solving for A, we get:

A = 8/3

Now, we can write the equation as:

y^(8/3)/(5^2 * x^2 * y^8/3) = y^(8/3)/(25 * x^2 * y^(8/3))

Comparing exponents again, we see that we need to find values of B and C such that:

B * C = 2

and

-8/3 = -C

Solving for C, we get:

C = 8/3

Substituting this value of C into the first equation, we get:

B * 8/3 = 2

Solving for B, we get:

B = 3/4

Therefore, the solution is:

A = 8/3

B = 3/4

C = 8/3

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1. What is the sum of the first 1,000 positive multiples of 3, starting with 3?
1,001,000
1,499,998
500,500
1,501,500

Answers

By answering the presented question, we may conclude that As a result, arithmetic the total of the first 1,000 positive multiples of three beginning with three is 1,501,500. As a result, (C) 500,500 is not the right answer.

what is arithmetic progression?

An arithmetic progression occurs when the difference between subsequent words in a series is always the same. The sequences 5, 7, 9, 11, 13, and 15 are examples of arithmetic progressions with a tolerance of 2. Arithmetic progression (A.P.) is a progression that has a set tolerance between any two successive numbers. There are two forms of mathematical progression: finite-length arithmetic series A finite geometric progression is a series with a finite number of terms. The series' terms may be used to calculate the early, late, tolerance, and number of terms.

The first positive multiple of three is three itself, followed by six, nine, and so on. As a result, the total of the first 1,000 positive multiples of three beginning with three is:

3 + 6 + 9 + ... + 3,000

S = (n/2)(a + l)

n = 1,000, a = 3, and l = 3,000 in this example (since the last term is 3 times the 1,000th term). When we enter these values into the formula, we get:

S = (1,000/2)(3 + 3,000)

S = 500(3,003) (3,003)

S = 1,501,500

As a result, the total of the first 1,000 positive multiples of three beginning with three is 1,501,500. As a result, (C) 500,500 is not the right answer.

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(3 + 2 i ) + ( 4-5 i ) =
(-5 + i) + (12 + 3i) =
(2-3 i )+(3-2i)=
(-7+5i ) + (4-2i)=
(11 +3i ) + (5 +6 i)​

Answers

(3 + 2 i ) + ( 4-5 i ) = 7 - 3i

(-5 + i) + (12 + 3i) = 7 + 4i

(2-3 i )+(3-2i)= 5 - 5i

(-7+5i ) + (4-2i)= -3 + 3i

(11 +3i ) + (5 +6 i)= 16 + 9i

an imaginary circle that goes through both retinae and the fixation point is known as

Answers

The Vieth-Müller Circle is an imaginary circle that passes between both retinae and the fixation point.

The Vieth-Müller Circle is an ophthalmology concept that depicts an imaginary circle that passes across the foveas (the primary points of the retinae that are responsible for acute, detailed vision) and the fixation point (the point at which the eyes are directed).

The Vieth-Müller Circle is significant because it helps to explain the phenomenon of binocular vision, which is the ability to perceive depth and three-dimensional space using both eyes together. The circle aids in the definition of the equivalent locations on the two retinae, which are sites that receive visual field information and are critical in combining the images from the two eyes into a single, three-dimensional perception.

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The imaginary circle that passes through both retinae and the fixation point is called the horopter. The horopter is important in visual perception as it represents the set of points in space that stimulate corresponding points on each retina, which is necessary for binocular vision and depth perception.


The Horopter is an imaginary circle that passes through both retinae and the fixation point. In this context:

1. "Imaginary" refers to the fact that the Horopter is a theoretical concept rather than a physical object.
2. "Retinae" are the light-sensitive layers at the back of both eyes, which play a crucial role in processing visual information.
3. "Fixation" is the point where both eyes are focused on a single object in the visual field.

In brief, the Horopter represents a collection of points in the 3D space that are perceived as having the same depth or distance as the fixation point. It helps in understanding binocular vision and depth perception, as points on the Horopter contribute to forming a single, fused image from both eyes.

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Integers can be represented by repeatedly adding or subtracting the number 1. For example, the integer 3 can be represented as 0 + 1 + 1 + 1, and the integer -3 can be represented as 0 - 1 - 1 - 1. Hence, the definition "an integer is the number 0 or any number obtained by repeatedly adding 1 to this number" is true.

Answers

"An integer is the number 0 or any number obtained by repeatedly adding 1 to this number" is not entirely true.

True that integers can be represented by repeatedly adding or subtracting the number 1,

The fact that integers can also be negative and can be obtained by repeatedly subtracting 1 from 0 or another negative integer.

The definition does not account for the fact that integers can be represented using other operations, such as multiplication or division. The integer 12 can be represented as 4 x 3 or as 24 ÷ 2.

A more accurate definition of an integer is a whole number that can be positive, negative, or zero.

Integers can be represented using addition, subtraction, multiplication, or division, and can be used to represent quantities such as counts, distances, temperatures, and other measurable quantities.

The original definition is a useful way to understand how integers can be represented using addition and subtraction, it is not a complete or entirely accurate definition of what integers are.

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help me please like right now as soon as possible write the answer in terms of pi and round the answer to the nearest hundredths place I will give branliest

Answers

Thus, the total surface area of cylinder is found to be 480π sq. cm.

Explain about the surface area of cylinder:

A cylinder's surface area is made up of its two congruent, parallel circular sides added together with its curved surface area. You must determine the Base Area (B) and Curved Surface Area in order to determine the surface area of a cylinder (CSA).

As a result, the base area multiplied by two and the area of a curved surface add up to the surface area or total surface of a cylinder.

Given data:

radius r = 8 cm

Height h = 22 cm

Total surface area of cylinder = 2*area of circle + area of curved cylinder

TSA = 2πr² + 2πrh

TSA = 2π(8)² + 2π(8)(22)

TSA = 2π(64) + 2π(176)

TSA = 128π + 352π

TSA = 480π sq. cm.

Thus, the total surface area of cylinder is found to be 480π sq. cm.

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Complete question-

Find the surface area of the cylinder with radius of 8 cm and height of 22 cm. write the answer in terms of pi and round the answer to the nearest hundredths place.

What is the dividend yield on Stock A that sells at
$20/share, when Company A pays a quarterly
dividend of $0.10 per share?
dividend yield = [?] %
Give your answer as a percent rounded to the
nearest tenth.

Answers

The calculated value of the dividend yield on Stock A is 2%.

Calculating the dividend yield on the Stock

The dividend yield is a ratio that indicates how much a company pays out in dividends relative to its stock price.

To calculate the dividend yield on Stock A, we need to divide the annual dividend per share by the stock price per share and then multiply by 100 to express it as a percentage.

Annual dividend per share = Quarterly dividend per share x 4

Annual dividend per share = $0.10 x 4 = $0.40

Now, we can calculate the dividend yield on Stock A:

Dividend yield = Annual dividend per share / Stock price per share x 100%

Dividend yield = $0.40 / $20 x 100%

Dividend yield = 2%

Therefore, the dividend yield on Stock A is 2%.

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Question 14(Multiple Choice Worth 2 points)
(Creating Graphical Representations MC)

A random sample of 100 middle schoolers were asked about their favorite sport. The following data was collected from the students.


Sport Basketball Baseball Soccer Tennis
Number of Students 17 12 27 44


Which of the following graphs correctly displays the data?
histogram with the title favorite sport and the x axis labeled sport and the y axis labeled number of students, with the first bar labeled basketball going to a value of 17, the second bar labeled baseball going to a value of 12, the third bar labeled soccer going to a value of 27, and the fourth bar labeled tennis going to a value of 44
histogram with the title favorite sport and the x axis labeled sport and the y axis labeled number of students, with the first bar labeled baseball going to a value of 17, the second bar labeled basketball going to a value of 12, the third bar labeled tennis going to a value of 27, and the fourth bar labeled soccer going to a value of 44
bar graph with the title favorite sport and the x axis labeled sport and the y axis labeled number of students, with the first bar labeled basketball going to a value of 17, the second bar labeled baseball going to a value of 12, the third bar labeled soccer going to a value of 27, and the fourth bar labeled tennis going to a value of 44
bar graph with the title favorite sport and the x axis labeled sport and the y axis labeled number of students, with the first bar labeled baseball going to a value of 17, the second bar labeled basketball going to a value of 12, the third bar labeled tennis going to a value of 27, and the fourth bar labeled soccer going to a value of 44
Question 15(Multiple Choice Worth 2 points)

Answers

The correct graph is: bar graph with the title favorite sport and the x axis labeled sport and the y axis labeled number of students, with the first bar labeled basketball going to a value of 17, the second bar labeled baseball going to a value of 12, the third bar labeled soccer going to a value of 27, and the fourth bar labeled tennis going to a value of 44

How to explain the graph

Since the data is categorical and discrete, a bar graph is appropriate to display the data. The bars should be labeled with the sports, and their heights should correspond to the number of students who chose each sport.

A histogram is not appropriate because the data is not continuous. Also, the order of the bars does not matter in this case since the data is not ordinal.

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Can someone help me asap? It’s due tomorrow. I will give brainiest if it’s correct.

Answers

The answer is 144.

Of the 25 times she rolled, she got numbers 1-4 fifteen times. That ratio is 15/25.

You just multiply 15/25 by 240/1 to get 144.

sally works in hr at a company with 20 full-time employees in one location. what employee census data should sally gather to prepare for a benefits bid? race, gender, and ethnicityage, marital status, and number of childrendisability and veteran statustenure and education levels

Answers

To prepare for a benefits bid, Sally should census gather data on the age, marital status, and number of children of the 20 full-time employees.

This information will help Sally determine what types of benefits would be most appealing to the employees and what types of benefits might be necessary to attract and retain talent.

Additionally, Sally should gather data on the tenure and education levels of the employees to help her understand what types of benefits might be necessary to incentivize employees to stay with the company long-term and to attract highly educated candidates.

Finally, Sally should consider gathering data on disability and veteran status to ensure that the company is providing adequate support for those employees who may require additional assistance.

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a survey researcher is most likely to use a(n) question when the dimensions of the variables are well defined.

Answers

In contrast, open-ended questions allow for more in-depth and nuanced responses but can be more difficult to analyze due to the variability of responses.

A survey researcher is most likely to use a closed-ended question when the dimensions of the variables are well defined. Closed-ended questions provide respondents with a list of predefined response options to choose from, which allows for easier categorization and analysis of the data. This type of question is ideal for measuring specific and clearly defined variables, such as demographic information or attitudes towards a particular issue. In contrast, open-ended questions allow for more in-depth and nuanced responses but can be more difficult to analyze due to the variability of responses.

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Nicky scored
18 points, 22 points, and 28 points in her
last three basketball games. How many
points does she need to score in her next
game to have a mean of 25 points per
game? Explain.

Answers

Answer:

To find out how many points Nicky needs to score in her next game, we can use the formula for the mean (also known as the average) of a set of numbers:

mean = (sum of all numbers) / (number of numbers)

We know that Nicky has played three games and scored, and points in them. So the sum of all her points is:

sum=18+22+28

sum=68

We also know that Nicky wants to have a mean of 25 points per game, and she has played three games already. If we add the score from her next game to the sum, we will have the total number of points she has scored in four games.

Area of semicircle:
Area of Rectangle:
Total Area:

Answers

1. The area of the semi circle is 56.52ft²

2. The area of the rectangle is 228ft²

3. The total area is 284.52ft²

What is area of a shape?

The area of a shape is the space occupied by the boundary of a plane figures like circles, rectangles, and triangles.

The area of a semi circle is expressed as;

A = 1/2 πr²

r = d/2 = 12/2 = 6ft

A = 1/2×3.14 × 6²

A = 56.52ft²

therefore the area of the semicircle is 56.52ft²

The area of a rectangle is expressed as;

A = l×w

= 19×12

= 228ft²

therefore the area of the rectangle is 228ft²

The total area = (228+56.52)ft²

= 284.52ft²

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Please help,, my teacher didnt show me how to do ths

Answers

Answer:

sorry did not mean to answer this

Step-by-step explanation:

Answer:

Domain: (0, ∞)

Range: (-∞, ∞)

Step-by-step explanation:

Domain solution: x > 0

Range solution: -∞ < f(x) < ∞

Hope this helps.

How is the volume of the first rectangular prism with base 2m by 3m and height 5m related to the volume of the second rectangular prism with base 3m by 5m and height 2​m? Explain.

Answers

Answer:

they have the same volume

Step-by-step explanation:

in order to find the volume of a rectangular prism you have to multiply the width,height and length.

2 × 3 × 5 = 30.since both prisms have the same numbers ,they have the same volume.

hope this helps :)

Answer:

The volumes of the two rectangular prisms are the same.

Step-by-step explanation:

For the first rectangular prism, the area of the base is 6 square meters, and the height is 5 meters, so the volume is 30 cubic meters.

For the second rectangular prism, the area of the base is 15 square meters, and the height is 2 meters, so the volume is 30 cubic meters, the same volume as the first rectangular prism.

How does the structure of each poem help to convey different feelings

Answers

The fraction of the total vote he should expect to get is 23/75.

What are fractions?

A fraction is a mathematical unit used to represent a portion of a whole or a ratio of two integers. They are shown as the top number, or numerator, and the bottom number, or denominator, separated by a line. The denominator is the total number of pieces that make up the whole, whereas the numerator is the number of shares or parts.

For instance, you may write 3/8 for the portion of pizza you consumed if there were 8 pieces and you only ate 3. This indicates that you consumed three of the pizza's eight equally sized portions.

From the given table we can determine the total number of votes are:

13 + 9 + 10 + 8 + 10 + 14 + 5 + 6 = 75.

Now, Jamal received 13 + 10 = 23 votes.

Thus, the fraction of the total vote he should expect to get is 23/75.

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what is inches to feet

Answers

Answer: 12 inches is one foot

Step-by-step explanation: hope that this is what you were asking ;)

Kenishe packs 3 crates of merchandise the crates have masses of 65 kg 72 kg and 42 kg how many kg of merchandise does Kenisha pack

Answers

As Kenisha packs three crates of merchandise having masses of 65kg , 72 kg and 42 kg, he or she packs total of 179 kg of merchandise.

Kenisha has 3 crates of merchandise.

Each of the crates have different masses, those  are as : first crate has mass 65 kg, second has mass of72 kg and third case has mass of 42 kg.

By simple addition rule we get,

The total masses of three crates is =  (65 + 72 + 42) kg

=179 kg

Thus, Kenisha has packed 179 kg of merchandise as he or she has packed three crates having masses 65 kg, 72kg and  42kg.

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The amount of time it would take you to go from Chicago to Las Vegas is equal to 1525 miles divided by your average rate of travel. Which equation describes how the time and rate of travel are related?

Answers

The equation that relates time and rate of travel is time = distance / rate, so for the given scenario, the equation would be time = 1525 miles / rate.

The equation that relates time and rate of travel is:

time = distance / rate

Where:

time is the time taken to travel the distance

distance is the distance between two places (in this case, from Chicago to Las Vegas)

rate is the rate of travel (the average speed)

So, for this specific case, the equation would be:

time = 1525 miles / rate

where rate is the average speed at which you travel from Chicago to Las Vegas.

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What is the square √ 64?

Answers

Step-by-step explanation:

[tex]8 ^{2} [/tex]

is your answer please make me brainalist and keep smiling

8*8=64 then

8 is your answer

Answer: Square root of 64 is 8

4 times the sum of a number and 4 is 8 less than 40

Answers

The unknown number is -8.

Define fraction

A fraction is an expression representing a subset of a whole. The numerator and the denominator, which are separated by a horizontal line, are expressed as a ratio. The denominator is the total number of equally sized components that make up the whole, whereas the numerator is the number of parts that are being taken into account.

Call the unidentified number "x" for now. The following equation may then be created from the provided sentence:

3(x + 4) = (1/2)x - 8

Now, we can solve for x by simplifying and rearranging the equation:

3x + 12 = (1/2)x - 8

dividing both sides by two to get rid of the fraction

6x + 24 = x - 16

Subtracting x from both sides:

5x + 24 = -16

Subtracting 24 from both sides:

5x = -40

Dividing both sides by 5:

x = -8

Therefore, the unknown number is -8.

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the complete question is:

Three times the sum of a number and 4 is 8 less than one-half the number. What is the number?

at confidence, what is the margin of error and the interval estimate of the number of -year-old drivers in 2008? round your answers to four decimal places.

Answers

Thus, the interval estimate of the number of drivers under the age of 19 in 2008, together with its margin of error of 0.0245.

Explain about the confidence interval:

An unknown population parameter's value is likely to be within the bounds of a confidence interval (CI), which is a range of values. Given the qualities of your sample data, these intervals reflect a likely domain for the parameter.

Confidence intervals are computed using a predetermined degree of confidence and are obtained from sample statistics.

Margin of error ME = z(α/2)√[p(1-p)/n]

confidence interval = 95%

z(α/2) value for the 95% confidence interval = 1.96 (taken from attached table)

P = 75% = 0.75

1-p = 1 - 0.75 = 0.25

n = 1200

Put the values in formula:

ME = (1.96)*√[0.75*0.25 / 1200]

ME = (1.96)*√0.00015625

ME = 0.0245

Thus, the interval estimate of the number of drivers under the age of 19 in 2008, together with its margin of error of 0.0245.

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Complete question:

Fewer young people are driving. In 1983, 87% of 19-year-olds had a driver’s license. Twenty-five years later (in 2008) that percentage had dropped to 75%. Suppose these results are based on a random sample of 1200 19-year-olds in 1983 and again in 2008.  At a 95% confidence, what is the margin of error and the interval estimate of the number of 19-year-old drivers in 2008?

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