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Statistics 102 Quiz 2 Section 1-Version 1_Solution

Statistics 102 Quiz 2 Section 1-Version 1_Solution -...

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Statistics 102 Quiz 2 Section 1 Your Answers: 1. d 2. c 3. b 4. b 1. The following JMP output is for the “Cars” data from Lecture 12. The response is the gas mileage (MPG) achieved by each model on highways (note that in lecture, we used a different response, the MPG achieved on city streets). We will use horsepower, weight, seating, and length as explanatory variables. Summary of Fit RSquare Root Mean Square Error 0.80 Mean of Response 2.15 Observations (or Sum Wgts) 26.0 222 Analysis of Variance Source DF Sum of Squares Mean Square F Ratio Model 4 3837.4 959.4 206.6 Error 217 1007.6 4.6 Prob > F C. Total 221 4844.99 <.0001* Parameter Estimates Term Estimate Std Error t Ratio Prob>|t| Intercept 27.3 2.30 11.83 <.0001* Horsepower -0.016 0.0037 -4.34 <.0001* Wt (1000lb) -5.95 0.36 -16.38 <.0001* Seating 0.031 0.18 0.17 0.86 Length 0.13 0.016 7.74 <.0001* Which of the following can you conclude from this analysis? a. Seating does not have a significant linear relationship with MPG after controlling for the other variables. b. After controlling for horsepower, weight, and seating, length has a positive association with MPG.
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