Wilpen Company, a price-setting firm, produces nearly 80 percent of all tennis balls purchased in the United States. Wilpen estimates the U.S. demand for its tennis balls by using the following linear specification: where Q is the number of cans of tennis balls sold quarterly, P is the wholesale price Wilpen charges for a can of tennis balls, M is the consumers’ average household income, and PR is the average price of tennis rackets. The regression results are as follows:

Without the regression results provided, it is not possible to provide step-by-step analysis or interpretation of the equation. Could you please provide the regression results?

I'm sorry, but you haven't provided the regression results. Could you please provide the regression results so that I can assist you further?