Birth Weights Refer to Data Set 3 “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. For critical values, use x2 L = 166.337 and x2 R = 245.449.

b. Repeat part

(a) using the 195 birth weights of boys and, for critical values, use x2 L = 157.321 and x2 R = 234.465.

c. Compare the results from part

(a) and part (b).