The personnel director of the communications firm in Exercise 17.5 has just provided another variable describing the company’s technical sales representatives: their scores on a sales aptitude test they were recently given. Using data file XR17015, with y = average dollar sales per call, x1 = years of experience, and x2 = score on the sales aptitude test, fit a second-order model with interaction to the data. Interpret the R2 value for the model and indicate whether, at the 0.05 level, the model is significant.
Answer to relevant QuestionsAuto Rental News has reported U.S. operations data for 15 top rental-car companies. Using data file XR17016, with y = rental revenue (millions of dollars), x1 = thousands of cars in service, and x2 = number of rental ...Repeat Exercise 17.19, but using a second-order model with interaction. Interpreting the R2 value, to what extent has inclusion of the squared terms improved the model’s explanatory power? In exercise For the Car and ...In a PC World comparison of computer hard drives, data describing the drives included the following variables: price (dollars), disk capacity (gigabytes), and rotational speed (RPM). The data are in file XR17027. With y = ...For the situation and variables in Exercise 17.8, fit an exponential model and use it to estimate the world record time for the 100-meter dash in the year 2014. The underlying data are in file XR17008. In exercise What is stepwise regression, and when is it desirable to make use of this multiple regression technique?
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