Problem Set 1: The One-way ANOVA

Research Scenario: Depressed patients are randomly assigned to 1 of 3 therapists. At the end of 3 months, each patient completes a standardized test of depression (higher scores indicate higher level of depression). The patients' scores are shown below. Analyze the data to determine how effective these 3 therapists are at treating depression (assume that before the treatment, all 3 groups of patients had the same average depression score).

Using this table, enter the data into a new SPSS data file and run a one-way ANOVA to test whether there is a difference in patients' depression scores among the three therapists. boxplot to show the difference among these scores.

1. Paste SPSS output.
2. Results section based on your analysis including independent and dependent variables, confidence interval, effect size, 1 or 2 tailed and the p value.
   

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