In an effort to determine if advertisement expenditures lead to greater revenue from online sales of surfboards, a firm considers 32 weeks of data. The regression model was Y = revenue (in thousand of dollars), X₁ = total expenditures in web advertising (in thousand of dollars), X₂ = total expenditures in print advertising (in thousand of dollars), and X₃ = average surfboard volume for the week (liters).The ANOVA table is presented below.

a) Write the null and alternative for the F-test.
b) Is the null rejected at α = 0.10?

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Source Regression Error Total df 3 28 31 SS 167.05 39.06 206.11 MS 55.68 1.40 F 39.92 p-Value 0