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In efforts to test the efficacy of treatments of a particular type of migraines a simple...

In efforts to test the efficacy of treatments of a particular type of migraines a simple random sample of patients were selected and assigned to either the treatment or control group. 146 patients from the sample were treated with oxygen and the remaining 152 were treated with ordinary air. Among the group that received the oxygen treatment, 117 were free from the headache 15 minutes after treatment. Among the group treated with ordinary air, 28 of them were free from the headache 15 minutes after treatment. Use a 0.04 significance level to determine if the oxygen treatment is effective.

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