A psychologist at a private mental health facility was asked to determine whether there was a clear difference in the length of stay for patients with different categories of diagnosis. Looking at the last seven patients in each of the three major categories, the results (in terms of weeks of stay) were as follows. Using the data below, test whether the length of stay for patients varies based on the category of diagnosis. Diagnosis Category Affective Disorders Cognitive Disorders Drug-related Conditions 7 12 8 6 8 10 5 9 12 6 11 10 9 11 9 5 10 11 6 9 12 1. In this specific scenario, what is the independent variable? Is it between or within-subjects? How many levels does it have, and what are they? 2. How do I create an appropriate graph in SPSS, and determine what is a potential confounding variable in this scenario? Explain your rationale. 3. How do I create a full write-up to include a complete statistical notation as shown in the weekly presentations. The write-up also needs interpretation. If significant, state how. If it is not significant, what does that mean in layman’s terms?
A psychologist at a private mental health facility was asked to determine whether there was a clear difference
in the length of stay for patients with different categories of diagnosis. Looking at the last seven patients in
each of the three major categories, the results (in terms of weeks of stay) were as follows. Using the data
below, test whether the length of stay for patients varies based on the category of diagnosis. Diagnosis Category
Affective Disorders Cognitive Disorders Drug-related Conditions
7 12 8
6 8 10
5 9 12
6 11 10
9 11 9
5 10 11
6 9 12
1. In this specific scenario, what is the independent variable? Is it between or within-subjects? How
many levels does it have, and what are they?
2. How do I create an appropriate graph in SPSS, and determine what is a potential confounding variable in this scenario? Explain your rationale.
3. How do I create a full write-up to include a complete statistical notation as shown in the weekly presentations. The write-up also needs interpretation. If significant, state how. If it is not significant, what does that mean in layman’s terms?
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