9. If there are ( m ) independent variables , the method of all possible regression models will estimate : A m2 models . B 2"m models . C 2m models . D m - 2 models . 10. In a simple linear regression model , the one unit change in X indicates that the response variable: A Will change by the value of the slope. B Will change by the value of the intercept . C Will change by'l . D Will be constant . 11. Which of the following is the estimated simple linear regression equation ? A y: BO + 81x + B y: B0 + Bix C y = b0 + b1x D Non of the previous 12. The spearman rank correlation test is used to check for : A The linearity of the model . B Normality of the errors . C Autocorrelation between the errors . D Heteroscedasticity