Question: 12.14 An experimenter is attempting to evaluate the relative effectiveness of four drugs in reducing the pain and trauma of persons suffering from migraine headaches.

12.14 An experimenter is attempting to evaluate the relative effectiveness of four drugs in reducing the pain and trauma of persons suffering from migraine headaches. Seven patients are given each drug for a month at a time. At the end of each month, each patient gave an estimate of the relative degree of pain suffered from migraines during that month on a scale from 0 to 10, with 10 denoting the most severe pain. Test the null hypothesis that the drugs are equally effective.

Drug 1 2 3 4 5 6 7 A 7 10 7 9 8 8 8 B 7 6 5 8 7 5 7 C 3 7 3 5 4 6 3 D 4 3 2 1 0 1 0

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