Consider the cob weight data from Exercise 12.2.6.
(a) Use the summaries in Exercise 12.2.6 to calculate the fitted regression line and approximate residual standard deviation.
(b) Interpret the value of the slope of the regression line, b1, in the context of this setting.
(c) SS(resid) = 1337.3. Use this value to compute the residual standard deviation. How does it compare to the approximate value determined in part (a)?
(d) Interpret the value of se in the context of this setting.
(e) What proportion of the variation in cob weights is explained by the linear relationship between cob weight and density?