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In a study of treatments for very painful "cluster" headaches, 152 patients were treated with oxygen...

In a study of treatments for very painful "cluster" headaches, 152 patients were treated with oxygen and 148 other patients were given a placebo consisting of ordinary air. Among the 152, patients in the oxygen treatment group, 108were free from headaches 15 minutes after treatment. Among the 148patients given the placebo, 24were free from headaches 15 minutes after treatment. Use a 0.05 significance level to test the claim that the oxygen treatment is effective.
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