W9 Practice Quiz Questions

Question 1

What does the t-test for the difference of 2 means test?

Answer 1

Whether the means of two independent populations are the same.

Question 2

How does an ANOVA test actually work?

Answer 2

By comparing the variation between the group means to the average within group variation.

Question 3

what value of ANOVA test statistics would you be least likely to reject the null hypothesis

Answer 3

When the F statistic is close to 1

Question 4

The test statistic for an ANOVA is

Answer 4

F = variance between groups/ variance within groups

Question 5

alternative hypotheses of a t-test for the difference of two means

Answer 5

That the means of two independent populations are not the same.
or
That one population mean is greater than the other one, where the populations are independent.

Question 6

What does the ANOVA assumption of Normality mean?

Answer 6

The populations from which we’re sampling follow an approximately Normal distribution.

Question 7

What is the hypotheses for the t-test for the difference of 2 means test?

Answer 7

H0: μ1 = μ2
H1: μ1 > μ2

where the observations are independent.

Question 8

when could you perform an ANOVA test?

Answer 8

We are interested in whether there is a difference in the mean test scores of students in four different schools.