Chapter 14, Problem 46PS

In Problem 14.6 on page 542, you used full-time voluntary turnover $\left(\%\right),$ and total worldwide revenue $\text{(\$billions)}$ to predict number of full-time job opening (stored in BestCompanies). Develop a regression model to predict the number of full-time job opening that includes full-time voluntary turnover, that worldwide revenue, and the interaction of full-time voluntary turnover and total worldwide revenue.

a. At the 0.05 level of significance, is there evidence that the interaction term makes a significant contribution to the model?

b. Which regression model is more appropriate, the one used in this problem or the one used in Problem 14.6? Explain.