Exam 3 Review - Chapter 10

Question 1

When should a paired samples t test be used?

Answer 1

When every participant of an experiment experiences all levels of the IV (within groups)

Question 2

How do you find degrees of freedom for a paired samples t test?

Answer 2

Subtract 1 from the number of pairs of scores

Question 3

How do you find the paired samples t statistic?

Answer 3

(sample mean - population mean*) / standard error estimate

*population mean is usually close to zero

Question 4

Assumptions for the paired samples t test

Answer 4

• Scale DV
• Nominal IV
• Random assignment
• Normal distribution
• Pairs of scores

Question 5

How to find 95% confidence interval for paired samples t test?

Answer 5

+/- t(sm) + M sample

Question 6

How to find Cohen’s d for paired sample t test?

Answer 6

(sample - population*) / standard deviation estimate

• population mean often equals zero in this case