The American Management Association wishes to have informati

The American Management Association wishes to have information on the mean income of store managers in the retail industry. A random sample of 256 managers reveals a sample mean of $45,420. the standard deviation of this population is $2050. You need to construct 90%, 95% and 99% CIs for the mean income of the population. Which CI is the widest?

a. 90% CI

b. 95% CI

c. 99% CI

d. I don\'t have enough information to decide.

Solution

Larger confidence levels produce wider confidence intervals.

Thus, the widest is

OPTION C: 99% CI [ANSWER]