STSCI Lab # 12

# STSCI Lab # 12 - Zaha Waseem Lab Assignment 12 Due Date...

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Zaha Waseem Lab Assignment # 12 11-12-2015 Due Date : 11-24-2015 Problem # 1 a. b. Coefficients: (Intercept) father.telomere.length 0.2473 0.9462 Prediction equation: Offspring Telomere length = 0.25 + 0.95 x (father’s telomere length) c. T-Test

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Zaha Waseem Lab Assignment # 12 11-12-2015 Due Date : 11-24-2015 H 0 = The slope of the regression of offspring’s telomere length by father’s telomere length is zero. H A = The slope of the regression of offspring’s telomere length by father’s telomere length isn’t zero. The t-value on the line with father’s telomere length is the test of the significance of the slope. The output shows that the t-statistics is large (4.157) with a small p-value (0.000171). We reject the null hypothesis that the slope coefficient is not 0 and conclude that the slope for this [prediction line is significantly different than zero. A more practical explanation is that father’s telomere length is a good predictor of offspring’s telomere length. d. Offspring Telomere length = 0.25 + 0.95 x (father’s telomere length) Offspring Telomere length = 0.25 + 0.95 x (0.61) = 0.8295 e. Higher R 2 values are preferred, since that suggests a higher correlation between the two variables. In the telomere example, R 2 is 0.307, indicating that 31% of the variability in offspring’s telomere length is explained by father’s telomere length. This is a moderately low percentage. Problem # 2 a. The correlation coefficient between the magnitude of the increase in
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