Question: A. Estimate by hand calculation the regression equation of the firms sales revenue (Y)

On its quality control expenditure (X) for the data given in the table 4.6.

B. Plot the estimated regression line on a graph that also shows the data points and the errors.

C. what would be the sales revenue of the firm when the firms expenditure on quality control is

$2 million per year? $9 million per year? Why would you expect these results to be greatly? Biased?