(Continuation of 12.S.27) The following are summary statistics for the selenium data in Exercise 12.S.27.
 = 20.685  = 156.599
sX = 13.4491 sY = 36.0595
r = 0.53729 SS(resid) = 17,573.4
(a) Calculate the regression line of Tooth selenium on Liver selenium.
(b) Compute a 95% confidence interval for the slope of the regression line.
(c) Interpret the interval computed in part (b) in the context of the problem.
(d) Using the interval computed in part (b), is it reasonable to believe that the slope is as small as 0.25 (ng/g)/(ug/g)?