Question

Suppose a retailer claims that the average wait time for a customer on its support line is 170 seconds. A random sample of 54 customers had an average wait time of 160 seconds. Assume the population standard deviation for wait time is 50 seconds. Using a 95% confidence interval, does this sample support the retailer's claim? Using a 35% confidence interval, does this sample support the retailer's claim? Select the correct choice below, and fill in the answer boxes to complete your choice (Round to two decimal places as needed.) OA. No, because the retailor's claim is not between the lower limit of seconds and the upper limit of seconds for the mean wat time. OB. Yes, because the retailer's claim is between the lower limit of seconds and the upper limit of seconds for the mean wait time.

Answer 1

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Given el = 170, 160, 5=50 n=54 The 95% confidence interval is (X - Zdra for 15+ Zdrz in ) 6 2d 12 = logo ( 160-1.96x um 160+1.96 * es (146.6638, 173.3361) vi ans. (6) Yes, because the retailer's claim is betweess the lower limit of 146.6638 and the upper limit of 173.3361 for the mean. wait time