From the variance F-test shown above, which of these conclusions is/are valid?

Question

Quizplus · Accepted Answer

The F-test is used to test the null hypothesis that the variances of two populations are equal. In this case, since we are only comparing the variance within one population (the class score distribution), the null hypothesis is that the variance is equal throughout the population. If the F-test shows a significant difference, then we can reject the null hypothesis and conclude that the variance is not equal throughout the population, i.e. there is a significant difference in the variance between the class score distribution. Therefore, choice A is the correct answer. Choices C, D, and E are not applicable to this situation, as there is no mention of confidence level or normality assumptions, and there are enough data points to conduct the F-test. Choice B is incorrect, as it contradicts the conclusion drawn from the F-test.

From the Variance F-Test Shown Above, Which of These Conclusions