How to Solve a Statistics Question #18. [HD]

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Published on January 5, 2019 7:20:35 AM ● Video Link: https://www.youtube.com/watch?v=dK9eDZyZcxM

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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.
Select the correct answer below.
A. To improve the study, accept only patients who do not believe that copper bracelets are a good treatment for arthritis. Then, assign the copper bracelets to patients in the treatment group, and nothing to patients in the control group. After a month, survey the patients on the levels of their pain.
B. To improve the study, accept only patients who believe that copper bracelets are a good treatment for arthritis. Then, assign the copper bracelets to patients in the treatment group, and nothing to patients in the control group. After a month, survey the patients on the levels of their pain.
C. To improve the study, the patients should be randomly divided into two groups; one group will be given the copper bracelets, and the other group will be given nothing. After a month, the patients will be surveyed on the levels of their pain.
D. To improve the study, the patients should be randomly divided into two groups; one group will be given the copper bracelets, and the other group will be given non-copper bracelets. After a month, the patients will be surveyed on the levels of their pain.

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