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We randomly divide 200 volunteers with headaches into two groups who take identical-looking pills. ...

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We randomly divide 200 volunteers with headaches into two groups who take identical-looking pills. ...

We randomly divide 200 volunteers with headaches into two groups who take identical-looking pills. One group gets a homeopathic remedy and the other a placebo. After 20 minutes we ask them to rate their headache pain as "no change", "somewhat better", "much better", or "gone". What is the appropriate test?

▸ 2-proportion z-test

▸ χ² test of homogeneity

▸ 2-sample t-test

▸ matched pairs t-test

▸ χ² test of independence

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Stats: Modeling the World

Edition: 4^th

Authors: Bock, Velleman, De Veaux

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