Sample A has a sample variance of 90 and sample size of 16 while sample B has a sample variance of 40 and sample size of 26. We want to test the hypothesis that the population variance A is higher than population variance B.

The critical value for this test at 1% level of significance is

a. 2.09

b. 2.85

c. 3.28

d. 2.28

The test statistic for this problem equals

a. 2.25

b. 2.4

c. 5.06

d. 0.2

At 1% significance level, the null hypothesis

a. should be rejected.

b. should be revised.

c. should not be rejected.

d. None of the alternatives is correct