a. Determine the sample correlation coefficients of (1) age with dry weight and (2) age with log10 dry weight. Interpret your results.
b. Using Fisher's Z transformation, obtain a 95% confidence interval for p based on each of the correlations obtained in part (a).
c. For each straight-line regression, determine r2 directly by squaring the r obtained in part (a); also determine r2 from the computer output or from the formula r2 = (SSY - SSE)/SSY. Interpret your results.
d. Based on the preceding results, which of the two regression lines provides the better fit? Explain. Does this agree with your earlier conclusion in Problem 1 (d) of Chapter 5?