6.3 Mean differences and differences in means

Question 1

When do you use a difference in means test?

Answer 1

For sample of two independent populations

Question 2

When do you use a mean differences test?

Answer 2

For two dependent, equal size samples

It is a test of paired comparisons

Question 3

How do you apply the result of the tests?

Answer 3

Reject if the test statistic greater than or lower than the critical value (if one tailed test)
If outside the critical value range (for two tailed test)

Question 4

What type of test is used for a difference in mean and mean differences test?

Answer 4

They both use a t-test

Question 5

What are the degrees of freedom for a difference in means test?

Answer 5

n1 +n2 - 1

Question 6

What are the degrees of freedom for a means differences test?

Answer 6

n-1 degrees of freedom