Aregression model relating x, number of salespersons at a branch office, to y, annual sales at the office (in thousands of dollars) provided the following computer output from a regressionanalysis of...

Aregression model relating x, number of salespersons at a branch office, to y, annual sales at the office (in thousands of dollars) provided the following computer output from a regressionanalysis of the data.The regression equation isY = 80.0 + 50.00 XPredictor Coef SE Coef TConstant 80.0 11.333 7.06X 50.0 5.482 9.12Analysis of VarianceSOURCE DF SS MSRegression 1 6828.6 6828.6Residual Error 28 2298.8 82.1Total 29 9127.4a. Write the estimated regression equation.b. How many branch offices were involved in the study?c. Compute the F statistic and test the significance of the relationship at a .05 level ofsignificance.d. Predict the annual sales at the Memphis branch office. This branch employs 12salespersons.