please help

15. The following is an ANOVA table for a multiple regression model. Source df SS MS Model 3 88.671 29.557 Error 26 231.036 8.886 Total 29 319.707 a. How many predictor variables were involved in this model? b. What was the sample size used to generate the model? c. Does the population have a useJl linear relationship based on this model? Use a = 0.05. The critical value is 17035326 = 2.98