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. What sign would you expect the actual value of to have? Find the value of
in the printout. Does this value confirm your expectation? Justify your answer.
Correct Answer:

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