Question

Suppose a researcher is interested in the effectiveness of a new novel talk therapy technique in reducing overall depression as identified via score report on the geriatric depression scale (GDS). In order to carry out this hypothesis, the researcher gathers a SRS of participants in the program and performs the GDS test prior to, and after initiation of the new therapy technique (on the same subjects). The following table summarizes the results:

GDS Score Prior to intervention	GDS Score Following intervention
12	8
13	7
12	7
14	9
11	6
11	7
12	8

1. Write out your null and alternative hypotheses.
2. Carry out the appropriate statistical test to determine if the talk therapy is effective (One-sided).
3. GDS Scale: normal 0-9, mild depressives 10-19, severe depressives 20-30

Answer 1