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Aaron has designed a trial to test a new energy drink. Fifty individuals in the treatment group try the new energy drink every day for
Aaron has designed a trial to test a new energy drink. Fifty individuals in the treatment group try the new energy drink every day for two weeks, and they describe a moderate increase in their energy levels. Fifty individuals in the control group drink sugar water every day for two weeks, and they describe a significant increase in their energy levels.
What has Aaron observed?
- The margin of error
- A confounding variable
- A sampling error
- The placebo effect
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