A textbook publisher compiled data on the total annual sales of its business textbooks for the past nine years
of its business textbooks for the past nine years :
(a) Using the appropriate model, predict textbook sales for the next five
next five years.
b) Prepare a control chart for the forecast using the original data and
limits of 3 standard deviations.
c) Assume that actual sales for the next five years will be :
What can we think about the effectiveness of the forecasting method?
Year 1 2 3 4 5 6 7 8 9
Sales (x 1,000) 39 44 48 52 55 57 62 69 73
Year 10 11 12 13 14
Sales (x 1,000) 77 82 87 91 50
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