Consider the following ANOVA table, describing the results of a regression analysis: Source df SS MS F Total XXXXXXXXXX Regression XXXXXXXXXX251.55 Residual XXXXXXXXXX a. How many predictor variables...

Consider the following ANOVA table, describing the results of a regression analysis:

Source df SS MS F

Total 23 2711.60

Regression 3 2641.59 880.53 251.55

Residual 20 70.01 3.50

a. How many predictor variables are in the equation?

b. What is the sample variance of the predictand?

c. What is the R²
value?

d. Estimate the probability that a prediction made by this regression will be within
 2 units of the actual value.