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.

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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.

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The Answer of 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.