Question: 22. This question refers to Problem 21. a. Fit the random model given by Equation 4 to the data in Table P-21 by estimating c

22. This question refers to Problem 21.

a. Fit the random model given by Equation 4 to the data in Table P-21 by estimating c with the sample mean so . Compute the residuals using .

b. Using Minitab or a similar program, compute the autocorrelations of the residuals from part c for the first 10 time lags. Is the random model adequate for the sales data? Explain.

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