Statistics Homework Solutions 178

Statistics Homework Solutions 178 - dle. The model is not...

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178 CHAPTER 7 (c) 0 5 10 15 20 25 -15 -10 -5 0 5 10 15 Order of Observations Residual The residuals increase over time. The linear model is not ap- propriate as is. Time, or other variables related to time, must be included in the model. 5. (a) y 235 32 0 695 x . (b) 0 1000 2000 3000 4000 5000 -1500 -1000 -500 0 500 1000 1500 Fitted Value The residual plot shows a pattern, with positive residuals at the higher and lower fitted values, and negative residuals in the mid-
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Unformatted text preview: dle. The model is not appropriate. (c) ln y 0745 925ln x . (d) 4.5 5 5.5 6 6.5 7 7.5 8-0.8-0.6-0.4-0.2 0.2 0.4 0.6 Fitted Value The residual plot shows no obvious pattern. The model is ap-propriate. (e) The log model is more appropriate. The 95% prediction interval is 197 26 1559 76 ....
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