Question: Some people believe that wearing copper bracelets is a good treatment for arthritis of the hand. To test this belief, suppose you recruit 100 people

Some people believe that wearing copper bracelets is a good treatment for arthritis of the hand. To test this belief, suppose you recruit 100 people and supply them all with copper bracelets. After the patients wear the bracelets for a month, you ask them whether or not their pain is less than it was before they began wearing the bracelets. Explain how to improve this study.

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