7. A multiple regression analysis with annual profits of a pharmaceutical product as the dependent variable Y, and annual advertising expenditures X₁ and annual sales X2 as the independent variables are done. A random sample of size 10 yielded values for the regression and total sum of squares of 400 and 500. The standard error of the estimate is: a. b. C. d. e. 100 14.286 3.780 3.536 unable to be determined with the information given.

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A: Step 1: