16. In a study of treatments for very painful cluster headaches, 159 patients were treated with oxygen
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16. In a study of treatments for very painful "cluster" headaches, 159 patients were treated with oxygen and 160 other patients were given a placebo consisting of ordinary air. Among the 159 patients in the oxygen treatment group, 126 were free from headaches 15 minutes after treatment. Among the 160 patients given the placebo, 22 were free from headaches 15 minutes after treatment. Use a 0.05 significance level to test the claim that the oxygen treatment is effective. Complete parts (a) through (c) below.
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