1.Describe two types of research designs used when selecting related samples.

the repeated-measures design and the matched-pairs design.

2.Calculate the degrees of freedom for the following and locate the critical value in the t table

20 siblings paired based on their relatedness

25 pairs of married couples

3.Compute and interpret effect size for these data (related-samples t test)

Before and after tutoring

BeforeAfter

2.43.0

2.52.8

3.03.5

2.93.1

2.73.5

You are testing whether the tutoring program is effective at .05 level of significance. You need to compute the value of the test statistic, make a decision, and then assess effect size using Cohen's d.

4.What are the advantages for selecting related samples?

5.Compute a related-samples t test for the following

Participants observed at two times

Time 1Time 2

48

32

57

46

63