5 The following ANOVA table was obtained when estimating a multiple lineariy, ession model. F NR Significance 0.0223 ANOVA Regression Residual Total 8.33 points MS 11,048.820 2,304.566 2 17 19 SS 22,097.64 39,177.62 61,275.26 a-1. How many explanatory variables were specified in the model? eBook Number of explanatory variables Print References a-2. How many observations were used? N of observations b. Choose the hypotheses to determine whether the explanatory variables are jointly significant NO: B1 - B2 - 0; NA: At least one By > 0 O No: Bi - B2 - 0; #At At least one By - 0 80 B1 - B2 = 0; HA: At least one by