Hw3 revised - Brittney Brown July 7 2010 Stat 4210 Homework...

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Brittney Brown July 7, 2010 Stat 4210 Homework 3 1. The model y = 6.14 + 0.0194 x6 could be used to estimate values ranging from 250 to 2250. The slope is 0.01939. For every one unit increase in x6, y is estimated to increase
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by 0.0194. We are 95% confident that the slope is between 0.0135 and 0.025. Studentized residuals were calculated. There were two observations that concerning (x6=2245, y=21.60 and x6=2196, y=75.62). The PRESS value was 3692.88. A normal probability graph and histogram were obtained for the data. The data follows a fairly normal distribution with the same two concerning outliers. A plot of residuals versus predicted y were also obtained. Again we see the two outliers that are concerning. Lastly, a plot of residuals versus the predictor was obtained. The problem areas are noted but the values are randomly disperse over the horizontal line.
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x6 1500.00 1000.00 500.00 0.00 -500.00 -1000.00 y 40.00 20.00 0.00 -20.00 Partial Regression Plot Dependent Variable: y The model y = 2.53 + 0.0185 x6 + 2.19 x7. The PRESS value was 3388.60.
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