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**ACME has 20 accountants. If the time it takes to complete the end of quarter report is normally A++**

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Question 11

ACME has 20 accountants. If the time it takes to complete the end of quarter report is normally distributed with a mean

of 30 hours and a standard deviation of 5 hours, the probability that it will take an accountant chosen at random less

than 27 hours is

.726

.0036

.274

.9964

Question 12

For the test of hypotheses:

Ho: mu <= 60

Ha: mu > 60

If you collect a sample of size 40 with a sample mean of 61 what would be the p-value assuming the population standard

deviation is 9?

.7589

.2411

.4558

.5442

Question 13

There are 500 bags of grain in the most recent shipment from Farm R Us. The weight of the bags are normally

distributed with a mean of 200 and a population standard deviation of 10 pounds. If you take a random sample of 20

bags, what is the probability that their average will be more than 201 pounds?

.540

.987

.013

.673

.327

.460

Question 14

The time it takes to complete the income tax forms is normally distributed with a mean of 10 hours with a standard

deviation of 2 hours. What is the probability that it will take more than 7 hours?

.001

.067

.999

.933

Question 15

It has been determined that the amount of time that it takes a manager to complete a simple clerical task has a mean of

400 minutes and a standard deviation of 70 minutes. If you collect a random sample of 50 managers, what is the

probability that their average will be more than 420 minutes?

Cannot determine since we do not know if the population is normally distributed.

.612

.978

.388

.022

Question 16

If a standardized test has scores that are normally distributed with a mean of 800 and a standard deviation of 100, how

high would you have to score to be in the upper 10th percentile?

928

668

1056

544

Question 17

Suppose a population has a population standard deviation of 50. What would be the upper limit of a 88 percent

confidence interval if you obtained a sample of size 60 that had a sample mean of 1000?

1010.0

1007.6

1058.7

1077.7

Question 18

For the test of hypotheses:

Ho: mu <= 50

Ha: mu > 50

If you collect a sample of size 60 with a sample mean of 52 what would be the p-value assuming the population standard

deviation is 10?

.9393

.4207

.0607

.5793

Question 19

For the test of hypotheses:

Ho: mu = 100

Ha: mu not equal to 100

If you collect a sample of size 64 with a sample mean of 104 what would be the p-value assuming the population

standard deviation is 20?

.5480

.1096

1.8904

.9452

Question 20

If you want to construct a 90 percent confidence interval that has a width of plus or minus 5, how large of a sample do

you need if the population standard deviation is 18?

34

137

55

8

Question 21

You are going to conduct a poll so that you can construct a 95 percent confidence interval with a margin of error of plus

or minus 6 percent. How many observations would you need to collect if you estimate that the population proportion is

approximately 80 percent?

246

582

171

231

Question 22

You are going to conduct a poll so that you can construct a 90 percent confidence interval with a margin of error of plus

or minus 7 percent. How many observations would you need to collect if you do not have a good idea of the value of the

population proportion?

325

139

196

84

**ACME has 20 accountants. If the time it takes to complete the end of quarter report is normally A++**

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- Submitted On 17 Dec, 2015 09:02:54

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