22. In exercise 4 the following estimated regression equation relating sales to inventory in- vestment and advertising

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22. In exercise 4 the following estimated regression equation relating sales to inventory in- vestment and advertising expenditures was given. = 25+ 10x + 8x2 The data used to develop the model came from a survey of 10 stores; for these data SST = 16,000 and SSR = 12,000.

a. Compute SSE, MSE, and MSR.

b. Use an F test and a .05 level of significance to determine whether there is a relation- ship among the variables.

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