Exhibit 15-6 Below you are given a partial Excel output based on a sample of 16 observations. ANOVA df SS MS F Regression 4,853 2,426.5 Residual 485.3 Coefficients Standard Error Intercept 12.924 4.425 X1 -3.682 2.630 X2 45.216 12.560 The test statistic used to determine if there is a relationship among the variables equals O a. .2 O b. .77 O c. 5 O d. -1.4