Question 6

n-20

x - 4.33

s = 3.50

Based on this information, the upper limit for a 95 percent confidence interval estimate for the true population mean is:

O about 7.83 miles.

O about 5.97 miles.

In an application to estimate the mean number of miles that downtown employees commute to work roundtrip each day, the following information is

given:

nearly 12.0 miles.

about 5.86 miles.

Question 7

Question 8

approximately $65.90

None of the above

2 points

The monthly electrical utility bills of all customers for the Far East Power and Light Company are known to be distributed as a normal distribution with

mean equal to $87.00 a month and standard deviation of $36.00. If a statistical sample of n 100 customers is selected at random, what is the probability

that the mean bill for those sampled will exceed $75.00?

O About 1.00

3.33

-0.33

O Approximately 0.63

Question 9

A population has a proportion equal to 0.30. Calculate the following probabilities with n=100. Find P(P >0.27).

O 0.6125

2 points

0.7422

0.8141

Seve Answer

In an effort to estimate the mean dollars spent per visit by customers of a food store, the manager has selected a random sample of 100 cash register

receipts. The mean of these was $45.67 with a sample standard deviation equal to $12.30. Assuming that he wants to develop a 90 percent confidence

interval estimate, the upper limit of the confidence interval estimate is:

about $2.02

about $47.69

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2 points

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