This study investigates whether there are differences in the outcomes of three different treatments for anxiety. The treatment conditions that are compared are treatment with medication, treatment with psychotherapy, and placebo (inactive pills). In addition, we want to see if gender of the client moderates the effects of the treatment. Every participant had been diagnosed with similar types and severity of anxiety disorders when they entered the study. Each participant was randomly assigned only to one of the three treatment conditions. After 12-weeks of treatment (or placebo), all participants completed two questionnaires to measure worry and general emotion. The higher the scores on these measures, the higher the anxiety level of the participant.
Directions:
The factorial MANOVA will combine what you have learned previously about
1. Post hoc tests when you have more than two groups on an IV (one-way ANOVA),
2. Main effects and interactions (factorial ANOVA), and
3. Working with multivariate analyses of multiple DVs (one-way MANOVA).
Using the SPSS data file for Module 6 (located in Topic Materials), answer the following questions:
1. What are the independent variables in this study? What are the dependent variables?
2. Why is a factorial MANOVA appropriate to use for this research design?
3. Did you find any errors that the researcher made when setting up the SPSS data file (don’t forget to check the variable view)? If so, what did you find? How did you correct it?
HINT:
Yes, there are coding errors for Measures.
4. Perform Initial Data Screening. What did you find regarding missing values, univariate outliers, multivariate outliers, normality?
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