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231hw11solutionsF11

# 231hw11solutionsF11 - Will Landau STAT 231 Homework 11...

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Will Landau November 20, 2011 STAT 231 Homework 11 Solutions 1

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To get a normal probability plot of the standardized residuals, I first put the stan- dardized residuals in one column of a table and go to Analyze > Distribution: 2
I drag my column name into the ”Y, Response” box and hit ”OK”: 3

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I click on the red triangle next to ”Standardized Residuals” in my output and select a ”Normal Quantile Plot”: 4
Now I make the display easier to read. I click and drag the plot window so that the plot appears bigger. Also, I highlight all the data in my table, right click the plot area, and select a bigger marker under the ”Row Markers” submenu: 5

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This points deviate severely from a straight line, which show that the standardized residuals are highly non-normal. 6
31. a. This proportion of variation is our R 2 value of 98.8%. b. The directions for homework 11 say to get the unadjusted R 2 values instead of the adjusted ones. For the cubic model, R 2 = 0 . 980 from the Minitab output in the problem statement. For the quadratic model, the problem statement (directions to part B) gives an R 2 value of 0.780. Informally, this suggests that the cubic model provides a better fit than the quadratic one,

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231hw11solutionsF11 - Will Landau STAT 231 Homework 11...

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