Question

Dr. Kruger wants to understand what treatments are most effective for treating anxiety. She is most interested in understanding how drug treatment interacts with small interventions in the real-world. She recruited 400 participants for her study and randomly assigned half of them to a new antidepressant drug, and the other half to a placebo. She also took each of those groups and randomly assigned participants to either a gratitude journal, daily mindfulness practice or nothing. After 10 weeks, she measured their levels of anxiety. 1. Was the drug treatment variable manipulated within, across, or between subject? 2. Was the intervention variable manipulated within, across, or between subjects? 3. Did Dr. Kruger conduct a factorial repeated measures, mixed factorial repeated measures, two-way factorial, one-way, or repeated measures ANOVA test for the results?

Answer 1

1)this is within subject

as sample sample is used

2)

intervention variable is between subjects

3)

this is mixed factorial repeated measures

A mixed factorial design involves two or more independent variables, of which at least one is a within-subjects (repeated measures) factor and at least one is a between-groups factor. In the simplest case, there will be one between-groups factor and one within-subjects factor.