Exhibit 15-2
A regression model between sales (y in $1000s), unit price (x1 in dollars) and television advertisement (x2 in dollars) resulted in the following function:

ŷ = 7 − 3x1 + 5x2

For this model, SSR = 3500, SSE = 1500, and the sample size is 18.

If we want to test for the significance of the regression model, the critical value of F at 95% confidence is .

a. 3.24

b. 3.29

c. 3.68

d. 4.54