Use SPSS for this Application Exercise: A group of biochemistry researchers deve
ID: 3526627 • Letter: U
Question
Use SPSS for this Application Exercise:
A group of biochemistry researchers developed a new medication for treating depression. To assess if the new medication is effective at treating depression, the researchers obtained a sample of depressive patients from a local clinic. The patients were then randomly assigned into taking the medication for a month or not. In addition, the patients were also randomly assigned into receiving psychotherapy for a month or not. At the end of the study, the patients were asked to fill out a depression inventory in which a higher score indicates more depression. The data are below. What can be concluded with ? = 0.01?
Psychotherapy
a) What is the appropriate test statistic?
---Select--- na one-way ANOVA within-subjects ANOVA two-way ANOVA
b) Compute the appropriate test statistic(s) to make a decision about H0.
Medication: p-value = ; Decision: ---Select--- Reject H0 Fail to reject H0
Psychotherapy: p-value = ; Decision: ---Select--- Reject H0 Fail to reject H0
Interaction: p-value = ; Decision: ---Select--- Reject H0 Fail to reject H0
c) Compute the corresponding effect size(s) and indicate magnitude(s).
Medication: ?2 = ; ---Select--- na trivial effect small effect medium effect large effect
Psychotherapy: ?2 = ; ---Select--- na trivial effect small effect medium effect large effect
Interaction: ?2 = ; ---Select--- na trivial effect small effect medium effect large effect
d) Make an interpretation based on the results.
- There is a medication difference in depression, or There is no medication difference in depression.
-There is a psychotherapy difference in depression, or There is no psychotherapy difference in depression.
-There is a medication by psychotherapy interaction in depression, or There is no medication by psychotherapy interaction in depression.
Medication no yes no 1013
9
13 12
10
13
8 yes 11
13
8
9 4
3
4
6
Explanation / Answer
A. The correct answer is Option 3. A two-way ANOVA should be used.
B. Medication: p-value = 0.0026; Decision: Reject H0.
Psychotherapy: p-value = 0.0065. Decision: Reject H0.
Interaction: p-value = 0.0167; Decision: Fail to Reject H0.
Please post the other questions separately as we are supposed to answer just one question or four sub parts of a question.
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