Question 19 (3 points) For the regression equation, if the error of the estimate (sy') is the same as the standard deviation of the Y scores (sy), then... A) .. the predictor variable is perfectly correlated with the outcome variable. ( B) .. the independent variable (X) does not help us predict the dependent variable (Y). ( C) .. the mean of the predictor variable is identical to the mean of the outcome variable. O D) ... we reject the null hypothesis