Essay
College Textbook Sales Narrative
A publisher of college textbooks conducted a study to relate profit per text y to cost of sales x over a six-year period when its sales force (and sales costs) were growing rapidly. These inflation-adjusted data (in thousands of dollars) were collected: Expecting profit per book to rise and then plateau, the publisher fitted the model
to the data.
-Refer to College Textbook Sales Narrative. Plot the data points. Does it look as though the quadratic model is necessary?
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