You may need to use the appropriate technology to answer this question. A regression 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 regression analysis of the data. Analysis of Variance SOURCE DE Adj SS Adj MS Regression 6828.6 6828 .6 Error 28 2298 . 8 82 . 1 Total 29 9127 . 4 Predictor Coef SE Coef T Constant 80. 0 11. 333 7.06 X 50.0 5. 482 9 . 12 Regression Equation Y = 80.0 + 50.00 X (a) 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 0.05 level of significance. State the null and alternative hypotheses. OHo: B1 20 Ha : P1