This question refers to Problem 21. a. Fit the random model given by Equation 3.4 to the

Question:

This question refers to Problem 21.
a. Fit the random model given by Equation 3.4 to the data in Table P-21 by estimating c with the sample mean so t = . Compute the residuals using et = Yt - t - .
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.
Problem 21
Table P-21 contains the weekly sales for a food item for 52 consecutive weeks.