how it explains our response variable y? Question 3 (39 points total. 13 points each ): For x= 1,4, 7 the average of the x's is 4 whereas the average of y=2,7, 9 is 6. a.) Find the standard deviation of the x's using the (=stdev.s () command in excel). What value do you get? b. ) Find the standard deviation of the y's using the (= stdex.s() command in excel). What value do you get. c.) For the linear model estimated Y= b1*X+ bo_, bl=r- and b. = y-bx . Find the value of the regression coefficients b1 and bo. (Hint: Remember, r= correlation coefficient , Sy= standard deviation of the y's, SX= standard deviation of the x's, y = average of the y's, x= average of the x's.)