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,12.17 In Problem 12.5 on page 417, you used reported magazine newsstand sales to predict audited sales (stored in the file ). For that data, SSR = 130,301.41 and SST = 144,538.64,.,a. Determine the coefficient of determination, , and interpret its meaning.,,b. Determine the standard error of the estimate.,,c. How useful do you think this regression model is for predicting audited sales?,

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