18. An analyst estimates the sales of a rm as a function of its advertising expenditures using the model Sales = 30 + B1Advertising +
18. An analyst estimates the sales of a rm as a function of its advertising expenditures using the model Sales = 30 + B1Advertising + 5. Using 20 observations. he nds that SSR= 199.93 and SST: 240.92. a. What proportion of the sample variation in sales is explained by advertising expenditures? b. What proportion of the sample variation in sales is unexplained by advertising expenditures
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