Question

Over the summer, you are interning at a medical clinic. The clinic tells you about a study

they recently ran to investigate how effective group therapy is for treating depression. The

clinic is so busy, they haven’t analyzed the results yet. You are feeling extra confident after

passing PHLS 451, so you offer to analyze their data!

The clinic randomly assigned 20 people to two conditions: group therapy or control. The

two groups are independent. After one month in group therapy or in the control

condition, participants rated their depression levels. The clinic asks you to use an alpha

level of 0.01 when analyzing the results.

Groups Therapy Depression Levels	Control Depression Levels
2	5
4	4
1	4
2	3
1	3
2	5
3	3
3	4
1	3
2	4

a.

Write your alternative and null hypotheses.

b.

Run your statistical analysis using SPSS. Summarize your results and conclusion

(i.e. include all three parts)

Answer 1

a)

H0: There is no significance difference between Groups Therapy Depression Levels and Control Depression Levels

H1: There is significance difference between Groups Therapy Depression Levels and Control Depression Levels

Let the los be alpha = 5%

b) From SPSS output

Test Statistic t = -2.85

P-value = 0.000

Here p-value < alpha 0.01 so we reject H0

Thus we conclude that there is significance difference between Groups Therapy Depression Levels and Control Depression Levels