Consider th e follow ing co m p e tin g h y p o th eses and relevant sum m ary statistics:

H0: σ21/σ22 = 1 HA: σ21/σ22 ≠ 1 A ssum e that the tw o populations are normally distributed.

a. Using th e p -value approach, co n d u ct this hyp othesis test at th e 5% significance level.

b. Confirm your conclusions by using th e critical value approach.

 P-399