Refer to Data Set 4 "Births" in Appendix B.
a. Use the 205 birth weights of girls to construct a 95% confidence interval estimate of the standard deviation of the population from which the sample was obtained.
b. Repeat part (a) using the 195 birth weights of boys.
c. Compare the results from part (a) and part (b).
Assume that each sample is a simple random sample obtained from a normally distributed population. Use Table 7-2 on page 338 to find the indicated sample size.