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The owner of a large chain of health spas has selected eight of her smaller clubs for a test in which she varies the size of the newspaper ad and the amount of the initiation fee discount to see how this might affect the number of prospective members who visit each club during the following week. The results are shown in the table on the next page.

a. Determine the least-squares multiple regression equation.

b. Interpret the y-intercept and partial regression coefficients.

c. What is the estimated number of new visitors to a club if the size of the ad is 5 column-inches and a $75 discount is offered?

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