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Southern New Hampshire University - MAT-240 R1062 – 8-3 MySatLab: Final Exam

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Applied Statistics

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Applied Statistics

MAT-240 R1062 – 8-3 MySatLab: Final Exam This Question: 10 pts 1 of 28 (0 complete) w §• This Test: 280 pts possible { Question Help @ A concrete mix is designed to withstand 3000 pounds per square inch (psi) of pressure. The following data represent the strength of nine randomly...

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southern new hampshire university mat 240 r1062 – 8 3 mysatlab final exam

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MAT-240 R1062 – 8-3 MySatLab: Final Exam
8-3 MyStatLab: Final Exam
This Question: 10 pts 1 of 28 (0 complete) w §• This Test: 280 pts possible

{ Question Help @

A concrete mix is designed to withstand 3000 pounds per square inch (psi) of pressure. The following data represent the strength of nine randomly selected casts
psi)
3970, 4090, 3300, 3000. 2950. 3820. 4090, 4030, 3690 o
Compute the mean, median and mode strength of the concrete (in psi).

Compute the mean strength of the concrete. Select the correct choice below and. if necessary, fill in the answer box to complete your choice.

’- -’ A. The mean strength of the concrete is psi of pressure.
(Round to the nearest tenth as needed.)
” ' B. The mean does not exist.

Compute the median strength of the concrete. Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

.’-*-’ A. The median strength of the concrete is psi of pressure.
(Round to the nearest tenth as needed.)
:' ” ' B. The median does not exist.

Compute the mo de stren gth of the concrete SeIect the correct choice below and. if ne cess ary fill in the answer box to complete your choice

’: ’ A. The mode of the strengths of the concrete is psi of pressure.
(Round to the nearest tenth as needed.)
' B. The mode does not exist.

This Question: 10 pts g 2 of 28 (1 complete} V §•

Compute the range and sample standard deviation for strength Df the concrete (in psi)

3960, 4130, 3100. 3100, 2960. 383D, 4130, 4060

The range is psi.

s= psi (Round to one decimal place as needed.)

,This Question: 10 pts g 3 of 28 {2 complete} V $•
This Tes

Determine whether the random variable is discrete or continuous. In each case state the possible values of the random variable
(aj The number of points scored during a basketball game.
(b} The time it takes to fly from City A to City B.

(a} Is the number of points scored during a basketball game discrete or continuous?

'.”..' A. The random variable is continuous. The possible values are x Z 0.
'o.' B. The random variable is discrete. The possible values are x = 0 1 2
'” .' C. The random variable is Th+ possible values are x 2 0
'.._.' D. The random variable is continuous. The possible values are x = 0 1, 2 .

(b} Is the time it takes to fly from CiTy A to City B discrete or continuous?

'.”.' A. The random variable is continuous. The possible values are t = 1, 2. 3.
'.”..' B. The random variable is discrete. The possible values are t > 0.
'” .' C. The random variable is Th+ possible values are I = 1. 2
'.+.' D. The random variable is continuous. The possible values are t > 0

4 0f 28 (3 complete) w

Determine the required value of the missing probability to make x P(x) a
the distribution a discrete probability distribution 3 0.19

0.31
0.25

P(4) = (Type an integer or a de

, This Question: 10 pts •§5 of 28 (4 complete) w § This Test: 280 pts
• possible

Question Help@
One graph in the ligure represents a normal distribution with mean y = 6 and standard deviation n = The other graph represents a normal
distribution with mean y = 16 and standard deviation a = 3. Determine which graph is \vhich and explain how you know.

Choose the correct answer below.
” ' A. Graph A has a mean of p = 16 and graph B has a mean of p = 6 oecause a larger mean sniffs the graph
to the right. ” ' B. Graph A has a mean of p = 6 and graph B has a mean of p = 16 oecause a larger mean
sniffs the graph to the left. 'ñ' C. Graph A has a mean of p = 6 and graph B has a mean of p = 16 oecause a
larger mean sniffs the graph to the right. ” ' D. Graph A has a mean of p = 16 and graph B has a mean of p = 6
oecause a larger mean sniffs the graph to the left.

This Question: 10 pts 6 of 28 (5 complete) w §•
This Test: 280 pts possible

, Question Help @

’t''buted with mean p = 50 and standard deviation a = 7. Co mpute the probab ilily. Be sure to drayy a norm al curve with the
are a cor h nd to th €• eob bility’ sha'
dd

> 39)

Click the icon to view a table of areas under the normal curve.

Which of the following normal curves corresponds to P(X > 39)?

P(X > 39) = 9420
{Round to four decimal places as needed. )

This Question: 10 pts
g 7 of 28 (6 complete) w §• This Test: 280 pts possible

• Question Help O

Fill in the blanks to correctly complete the sentence below.

Suppose a simple random sample of size n is drawn from a large population with mean p and standard deviation o. The sample distribution of x has mean y{ =
and standard deviation o§ =

Suppose a simple random sample of size n s drawn from a large population with mean p and standard deviation o. The sample distribution of x has mean y{ =

and stand ard deviation oj =

, This Question: 10 pts g 8 0f 28 (7 complete} w $•

Describe the sampling distribution of p. Assume the size of the population is 25.000.

n = 5D0, p = 0.5

Choose the phrase that best describes the shape of the sampling distribution of p below.

'”” ! A. Not normal because n S 0.05N and np(1— p) < 10.
!•! B. Approximately normal because n S 0.05N and np(1 — p) Z 10
'”” ! C. Approximately normal because n 0.05N and np(1 — p) < 10
!.”.! D. Not normal because n C 0.05N and np(1— p) z 10

Determine the mean of the sampling distribution of p.

g• = (Round to one decimal place as needed )

Determine the standard deviation of the sampling distribution of p.

o• = (Round to three decimal places as needed.)

This Question: 10 pts g 9 of 28 (8 complete) V §•

Compute the critical value z / 2 that corresponds to a 94% level of confidence

z2= 1
(Round to two decimal places as needed.)

This Question. 10 pts g 10 of 28 (9 complete) w $•

Constru4 a confidence interval of the population proportion at the given level of confidence.

x = 175 .n = 250. 90% confidence

The 90’4 confidence interval is ( , ).
(Use ascending Round to three decimal places as needed.)

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Exam (elaborations)

Southern New Hampshire University - MAT-240 R1062 – 8-3 MySatLab: Final Exam

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