1. What are the 3 different research designs for which a dependent samples t-test is the appropriate tool for statistical analysis?

1. 2. 3.

2. How are degrees of freedom for a dependent samples t-test calculated? To what does "n" refer to in a dependent samples t-test?

3. When a treatment has a consistent effect, variability is { low / high }? Circle one

4. Assume you have pretested a group of participants on the number of errors they make in the translation of a short poem from one language to another langue. You then train the subjects in translation strategies. You measure the number of errors in translating a poem again after the training. Test whether the training decreases the number of errors. Include Cohen's d. Use a=.05

Raw data:

Subject:	1	2	3	4	5	6
Pretest:	14	9	7	12	10	8
Postest:	13	10	9	6	6	10

5. Assume you are interested in whether people are distracted from working on a task by having present a mirror in which they can see themselves. Assume you have assigned matched pairs of subjects to an experimental and a control group. The experimental group is asked to solve a difficult puzzle while seated in front of a mirror. The control subjects have no mirror in the room. Test for if the groups differ or not. The data are given below. Include Cohen's d. Use a=.01

Raw data:

Pair:	1	2	3	4	5	6	7
Experimental:	22	16	21	19	10	17	14
Control:	17	10	17	13	6	13	14