Watson &Watson; Repair Inc. provides maintenance service for a large apartment c

Question

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 cach, Rafael and Andy. You also have time since last maintenance. You should accomplish your analysis step by step, including one variable at a time. First look at the correlations table to figure out the relationship between variables. STEP 1: use the dummy variable REPAIRPERSON-1 IF responsible = RAFAEL REPAIRPERSON = 0 IF responsible = ANDY RUN a regression model using ONLY repairperson as variable to explain REPAIRTIME 1) (2pt) Comment on goodness of fit of the model 2) 5pt) Report the statistical significance of the coefficients STEP 2: Use MONTHS SINCE LAST SERVICE AND REPAIRPERSON in a regression to explain REPAIRTIME 3) (2pt) Comment on the scatter diagram for Months-since-last-service and Repairtime. 4) (5pt) Comment on goodness of fit of this model 5) (Spt) Why do you think Repairperson is important or unimportant in this model?

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