In Problem 14.7 on page 480, you used the total staff present and remote hours to predict standby hours (stored in Standby). Using the results from that problem,

a. at the 0.05 level of significance, determine whether each independent variable makes a significant contribution to the regression model. On the basis of these results, indicate the most appropriate regression model for this set of data.

b. compute the coefficients of partial determination, r2 Y1.2 and r2 Y2.1, and interpret their meaning.