the following questions: a. Write out a regression equation regressing INCOME (dependent variable) on EDUC. b. Run this regression in Excel. Report the intercept (constant) and the coefficient for EDUC. Put these values into your regression equation in a. c. How many observations are there in the sample? d. What is the sample standard deviation of the variable INCOME? e. What is the R2 in the model? What the R2 measure? g. How do you interpret the coefficient EDUC on INCOME? Put this relationship into words