(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. MODEL 1:Regression model using only a dummy variable REPAIRPERSON 1 IF maintenance person - RAFAEL REPAIRPERSON 0 IF maintenance person- ANDY 1) (2pt) Comment on goodness of fit of the model Model Summary Model R Square Adjusted R Std. Error of the Estimate 70071 Square 783a 614 a. Predictors: (Constant), Repairperson b. Dependent Variable: Repairtime

Explanation / Answer

Solution1:

R sq=0.614

0.614*100=61.4% variation in repairtime is explained by model.

Rest 38.6% is unexplained

not a good model.

Solution2:

for intercept p value=0.000 and p<0.05

for repairperson p=0.007 and p<0.05

p<0.05

Intercept and repairperson are signiicant

Solution3:

there exists a positive relationship between months since last service and repair time.

as  months since last service increases , repair time increases.

Solution4:

R sq=0.705

70.5% variation in repair time is explained by repair persona nd months last service

Adj R sq=0.620

standard error of the estimate decreased

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