Pulse Rates A medical researcher wants to determine whether male pulse rates vary more or less than female pulse rates. Using the sample pulse rates in Data Set 1 in Appendix B, the male pulse rates can be summarized with the statistics n 5 40, 5 69.4, s 5 11.3. For females, the statistics are n 5 40, 5 76.3, s 5 12.5.

a. Construct a 95% confidence interval estimate of the population standard deviation s of pulse rates for males.

b. Construct a 95% confidence interval estimate of the population standard deviation s of pulse rates for females.

c. Compare the preceding results. Does it appear that the population standard deviations for males and females are different? Why or why not?