**QUESTION:**

1A textbook publishing company has compiled data on total annual sales of its business texts for the preceding nine years:

a. Using an appropriate model, forecast textbook sales for each of the next five years.

b. Prepare a control chart for the forecast errors using the original data. Use 2s limits.

c. Suppose actual sales for the next five years turn out as follows:

Is the forecast performing adequately? Explain.

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