7.11 A simple random sampleof n = 300 full-time

employees is selected from a company list containing the

names of all, N = 5,000 full-time employees in order to

evaluate job satisfaction.

a. Give an example of possible coverage error.

b. Give an example of possible nonresponse error.

c. Give an example of possible samplingerror.

d. Give an example of possible measurement error.

7.15 Given a normal distributionwith m = 100 and

s = 10, if you select a sample of n = 25, what is the probabilitythat

X is.

a. less than 95?

b. between 95 and 97.5?

c. above 102.2?

d. There is a 65% chance that X is above what value?

7.21 Time spent using e-mail per session is normally distributed,

with m = 8, minutes and s = 2 minutes, if you

select a random sample of 25 sessions,

a. what is the probability that the sample meanis between

7.8 and 8.2 minutes?

c. If you select a random sample of 100 sessions, what is

the probability that the sample mean is between 7.8 and

8.2 minutes?

The expert examines sampling distributions and confidence intervals.