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Investigation 12

# Investigation 12 - Vanessa Reapor Statistics 252 Section 07...

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Vanessa Reapor Statistics 252, Section 07 March 3, 2010 Investigation 12: Smoking and Lung Capacity A. Graph Attached. There is an overlap in FEV distributions across nonsmokers and smokers. The centers and spreads are of both FEV distributions are similar. The shapes are generally symmetric. However, nonsmokers has outliers compared to smokers. B. Regression Equation: FEV = 2.57 + .711 SmokeCode R 2 : 6% Smoker: FEV = 2.57 + .711(1) = 3.281 Liters Nonsmoker: FEV = 2.57 + .711 (0) = 2.57 Liters C. H 0 : β 1 = 0 H A : β 1 = 0 T-Test Statistic: 6.46 P-Value: .000 Conclusion: Reject H 0, Strong evidence to say smoking is related to FEV. Regression Analysis: FEV versus SmokeCode The regression equation is FEV = 2.57 + 0.711 SmokeCode Predictor Coef SE Coef T P Constant 2.56614 0.03466 74.04 0.000 SmokeCode 0.7107 0.1099 6.46 0.000 S = 0.841185 R-Sq = 6.0% R-Sq(adj) = 5.9% Analysis of Variance Source DF SS MS F P Regression 1 29.570 29.570 41.79 0.000 Residual Error 652 461.350 0.708 Total 653 490.920

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D. Regression Equation: FEV = .253 + .243 Age + 1.94 SmokeCode - .163 age*smokecode
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Investigation 12 - Vanessa Reapor Statistics 252 Section 07...

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