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 with the

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 with the sample mean Y so Y, Y. Compute the residuals

e, Y,-, Y-Y.

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

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