Problem Set 1: The Two-Factor ANOVA for Independent Measures

Research Scenario A group of clinical psychologists sets up a treatment study to look at the effects of treatment type & treatment setting (community clinic or university clinic) on symptom severity in a sample of patients with diagnosed Major Depressive Disorder. They recruit 12 participants from each type of clinic (though one person eventually drops out of one group), and divide them further into two groups, one of which receives cognitive-behavioral therapy (CBT) and one of which receives psychodynamic (PD) therapy. The psychologists measure depressive symptomology using the Beck Depression Inventory (Beck et al., 1961), and scores can range from 0 to 62. Their results are in the table below.

Conduct a two-way ANOVA to determine whether treatment type &/or treatment setting have an effect on the severity of depressive symptoms. multiple line graph that shows the difference in BDI scores among the groups.

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