Chapter 10 Part 2: Dependent Samples

Question 1

What are the two factors that determine which test statistic to use?

Answer 1

Sample size, whether pop variance is known

Question 2

Look at explanations of chapter equations

Question 3

What happens if the interval contains 0?

Answer 3

Then we cant be confident that there is a difference

Question 4

Changing from a confidence level of 95% to 99% will do which of the following to the confidence interval?

Answer 4

Increase confidence and decrease precision

Question 5

How does having dependent samples change our standard error term?

Answer 5

We are dealing with paired data, calculated based on difference between pairs not individual data points, standard error can be smaller, increase sensitivity of the test

Question 6

What effect should this have on the power of a test relative to independent samples tests?

Answer 6

Dependent have more power than independent, standard error is smaller in dependent, easier to detect true effect,

Question 7

when may the power not be greater?

Answer 7

If assumption is violated