Assuming the distributions for females and males are normally distributed, examine the following information.

Female Male nf = 20 nm = 15 xf = 9 xm = 12 sf = 7 sm = 8

a. Construct a 95% confidence interval for mf - mm by assuming the population variances are not equal.

b. If given sf = 4 and sm = 3, construct a 95%

confidence interval for mf - mm.

c. Compare your findings in parts a and b.