Kennesaw State University Statistics Regression Questions

Question Description

Use SAS to do the following analysis and answer questions. Dataset ch05q01.txt is in the Data folder, where DRYWT and LOGDRYWG represent dry weight and log10(dry weight), respectively.

Determine the sample correlation coefficients of (1) age with dry weight and (2) age with log10(dry weight). Which pair has stronger association? For each of them, test whether , and interpret your results.
Using Fishers Z transformation, obtain a 95% CI for between (1) age and dry weight, (2) age with log10(dry weight).
Fit two regression lines: (1) dry weight on age, (2) log10(dry weight) on age. Write down the fitted regression lines.
For each model in (c), get the residual plots and comment on whether the assumptions of straight line regression are satisfied. Does the log transformation of dry weight improve the model fitting?

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