The test procedure is based upon the sample standard deviations and from Group 1 and 2 with the respective sample size and . The test statistic is likely observed around, greater than, or less than unity under the respective null hypothesis `` ,'' `` ,'' or `` .'' The opposite of such observation is expressed by p-value < , suggesting an evidence against the null hypothesis . To check the plausibility of equal variances, we reason that the null hypothesis `` '' can be accepted when we fail to reject it. The F-test is known to be very sensitive to the appropriateness of normality assumption.