Suppose a retainer claims that the average wait time for a customer on its suppo

Question

Suppose a retainer claims that the average wait time for a customer on its support line is 189 seconds. A random sample of 53 customers had an average wait time of 179 seconds. Assume the population standard deviation for wait time is 49 seconds. Using a 95% confidence interval, does this sample support the retailer's claim? Using a 95% 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) A. Yes, because the retailer's claim is between the lower limit of _____ seconds and the upper limit of ______ seconds for the mean wait time. B. No, because the retailer's claim is not between the lower limit of _____ seconds and the upper limit of _______ seconds for the mean wait time.

Explanation / Answer

for 53 sample size; std error of mean =std deviation/(n)1/2 =6.7307

and for 95% CI, z=1.96

hence confidence interval =mean +/- z*std error =175.81 ; 202.19

A) yes because ......lower limit 175.81 seconds upper limit of 202.19 seconds

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