Question: 28. Refer to Problem 27.The default multiplicative decomposition in Minitab assumes a linear trend. Fit and plot a linear trend line to the Wal-Mart sales.

28. Refer to Problem 27.The default multiplicative decomposition in Minitab assumes a linear trend. Fit and plot a linear trend line to the Wal-Mart sales. Is a linear trend appropriate for these data? If not, can you suggest a trend curve that might be appropriate? Fit your suggested trend curve and store the residuals. Compute the residual autocorrelations. Do the residual autocorrelations suggest a seasonal component? Explain.

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