33. Exercise 16 of Section 12.2 included MINITAB output for a regression of daughter s height on the midparent height.

a. Use the output to calculate a con dence interval with a con dence level of 95% for the slope b1 of the population regression line, and interpret the resulting interval.

b. Suppose it had previously been believed that when midparent height increased by 1 inch, the associated true average change in the daughter s height would be at least 1 inch. Does the sample data contradict this belief? State and test the relevant hypotheses.