(35 pt) Watson & Watson Repair Inc. provides maintenance service for a large apa

Question

(35 pt) Watson & Watson Repair Inc. provides maintenance service for a large apartment complex in downtown Saint Petersburg, Florida. The managers are evaluating the possibility of hiring another maintenance person due to the increase of maintenance calls. Rafael Roddick and Andy Nadal are currently responsible for maintenance tasks. To investigate “what” drives Repair Time and be able to hire the best candidate, the managers hire you as statistician to conduct a regression analysis. As dependent variable you have time of repair for each, Rafael and Andy. You also have time since last maintenance.

Explanation / Answer

10. Ans: In this question, the only quadratic model is provided. Hence, I can not compare the models.

11. The estimation equation for the QUADRATIC model is

y^= 0.213 +1.130 *x - 0.072 *x^2.

where, y is the repair time and x is independent variable month last service.

12) The average repair time for the quadratic model is 0.213.

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