10 15 20 10 15 20 10 15 10 15 20 4. For each part below, list all of the plots a
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Question
10 15 20 10 15 20 10 15 10 15 20 4. For each part below, list all of the plots above that are described. A statement may describe [2 pts each] more than one plot! (e.g. an answer might be "A and C") (a) has one (residual) outlier (b) shows no apparent violations of the usual SLR model assumptions c) has one point with especially high leverage (d) the residual-versus-fitted plot for SLR would show curvature 5. For a data set consisting of 32 different cars, consider the linear regression of their quarter-mile time qsec (seconds) on three variables: hp (gross horsepower), disp (displacement, cu. in.), and wt (weight, lb/1000) (a) With gross horsepower in the model, is there evidence that the terms for displacement and weight are needed? State Ho and Ha for a test that answers this question. [3 pts (b) For the least squares fit of the model with hp, disp, and wt as predictors, the residual sum of squares (RSS) is 31.6. For the model with only hp, the RSS is 49.3. Compute an F-statistic appropriate for testing the hypotheses of the previous part 5 pts]Explanation / Answer
4.
Answer to the question is as follows:
a. has one (residual) outlier - C and D
b. shows no apparent vioilations of the usual SLR assumptions - A
c. has one point with especially high leverage - C and D
d. the residual-versuus-fitted plot for SLR would show curvature - B
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