Exhibit 9-4 The Manager of a Grocery Store Has Taken a Random

Multiple Choice

Exhibit 9-4
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes with a standard deviation of 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
-Refer to Exhibit 9-4. At 95% confidence, it can be concluded that the mean of the population is

A) significantly greater than 3
B) not significantly greater than 3
C) significantly less than 3
D) significantly greater then 3.18