Question: 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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