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wrote...
Posts: 193
3 weeks ago
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
Textbook 

Stats: Modeling the World


Edition: 4th
Authors:
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Posts: 259
3 weeks ago
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χ2 test of homogeneity
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