the data below are the number of absences and the final grades of 9 randomly selected students from a statistics class. number of absences, x | 0 3 6 4 9 2 15 8 5 final grade, y | 98 86 80 82 71 92 55 76 82 a) find the equation of the regression line for this data. b) assuming that there is a significant linear relationship between these variables, what is the best predicted grade for a student with 11 absences? c) calculate the correlation coefficient. d) calculate the standard error for the model.