For conducting the hypothesis test given below, which of the following test statistics is most appropriate?
H0: variance A = variance B.
Where the test is based on two random independent samples from two normally distributed populations.
A.  t-statistic.
B.  F-statistic.
C.  Z-statistic.
D.  chi-square
Answer:B
The test to compare variances of two normally distributed populations is F-statistic.