Answer the following questions using the data from Problem 14.50: ,a. Calculate the coefficient of determination. ,b. Using ? = 0.05, test the significance of the population coefficient of determination. ,c. Construct a 90% confidence interval for the average customer rating from customers who are on hold for 5 minutes. ,d. Construct a 90% prediction interval for the customer rating from a customer who is on hold for 5 minutes.,In Problem

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