Worksheet 23: The Potential Outcomes Model#
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Antonioli and Reveley (2005) investigated whether swimming with dolphins could be therapeutic for patients suffering from clinical depression.
Recruited 30 subjects with a clinical diagnosis of mild to moderate depression.
Randomly assigned subjects to one of two treatment groups of 15 subjects each. Both groups engaged in one hour of swimming and snorkeling each day, but
Dolphin Therapy group did so in the presence of bottlenose dolphins
Control group did not.
At the end of two weeks, each subject’s level of depression was evaluated.
10 subjects in the Dolphin Therapy group showed improvement
3 subjects in the Control group showed improvement
What is the null hypothesis for this experiment?
When you used the potential outcomes applet, what was your \(p\)-value for the difference in means between the treatment and control group? Should you reject the null hypothesis at level \(\alpha = 0.05\)?