Question: QUESTION 21 (Waiting time in a store] Let u denote the average waiting time (in minutes) of a customer in a local grocery store. The

QUESTION 21 (Waiting time in a store] Let u
QUESTION 21 (Waiting time in a store] Let u denote the average waiting time (in minutes) of a customer in a local grocery store. The manager of the store wants to test the following hypothesis: How S5 Hor > 5. To assess this, the manager has taken a random sample of 100 customers and recorded their waiting times. From the sample, the average length of time it took these 100 customers to check out was 5.2 minutes and the sample standard deviation is 2 minutes. The test statistic is O a. 2-statistic -2.50 O b.t-statistic - 2.50 O c. z-statistic = 1 O d. t-statistic - 1

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