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# ex3_f09 - STA 6166 Exam 3 Fall 2009 PRINT Name A study was...

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STA 6166 – Exam 3 – Fall 2009 PRINT Name _____________________ A study was conducted to relate weight gain in chickens (Y) to the amount of the amino acid lysine ingested by the chicken (X). A simple linear regression is fit to the data. ANOVA df SS MS F P-value Regression 1 27.07 27.07 23.79 0.0012 Residual 8 9.10 1.14 Total 9 36.18 CoefficientsStandard Error t Stat P-value Intercept 12.4802 1.2637 9.8762 0.0000 lysine(X) 36.8929 7.5640 4.8774 0.0012 Give the fitted equation, and the predicted value for X=0.20 Give a 95% Confidence Interval for the MEAN weight gain of all chickens with X=0.20 (Note: the mean of X is 0.16 and S XX =0.020) What proportion of the variation in weight gain is “explained” by lysine intake?

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A researcher reports that the correlation between length (inches) and weight (pounds) of a sample of 16 male adults of a species is r=0.40. Test whether she can conclude there is a POSITIVE correlation in the population of all adult males of this species: o H 0 : ρ = 0 H A : ρ > 0 o Test Statistic: o Rejection Region ( α =0.05): o Conclude: Positive Association or No Positive Association A colleague from Europe transforms the data from length in inches to centimeters (1 inch=2.54 cm) and weight from pounds to kilograms (1 pound=2.2 kg). What is the colleague’s estimate of the correlation?
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ex3_f09 - STA 6166 Exam 3 Fall 2009 PRINT Name A study was...

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