Exhibit 9-1 The manager of a grocery store has taken a random sample of 100 cust
ID: 2777062 • Letter: E
Question
Exhibit 9-1 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. The population standard deviation is known to be 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 9-1. At a .05 level of significance, 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
Explanation / Answer
The t-test statistic is 2.00
The p-value is 0.024
a .05 level of significance, it can be concluded that the mean of the population is a. significantly greater than 3
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