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An experiment must have a placebo group in order to be valid.a. Trueb. False

An experiment must have a placebo group in order to be valid.a. Trueb. False
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An experiment must have a placebo group in order to be valid.a. Trueb. False

User Simon Ferndriger
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Answer: True

Explanation: a placebo, or control group, helps show that the results of the experiment didn't just happen by chance.

User Amorphic
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