Question: A textbook publishing company has compiled data on total annual sales of its business texts for the preceding nine years: a. Using an appropriate model,

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

Year: Sales (000): 40.2 57.1 62.4 69.0 73.7 48.0 52.3 44.5 55.8

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.

Year: Sales (000): 40.2 57.1 62.4 69.0 73.7 48.0 52.3 44.5 55.8

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