Question

In January 2012, the Harvard Health Letter reported that British researchers compared a 12-week yoga program with the usual care provided by Britain's National Health Service. It showed that yoga was more effective in reducing back pain than the usual care.
a. What do you need to know to decide whether this was an observational study or a controlled experiment?
b. Why do controlled experiments with randomization allow us to draw conclusions implying cause and effect?


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  • CreatedJuly 16, 2015
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