An Experimenter Conducts an Experiment on the Effects of a Drug

question 591

Multiple Choice

An experimenter conducts an experiment on the effects of a drug to control hallucinations. The experimenter declares the results to be "statistically significant," which usually means that

• A)even though appropriate statistics were used, no differences could be detected between the experimental and control groups.
• B)the results have important implications for theory or practice.
• C)differences of this size between the experimental and control groups would occur by chance only five times out of 100 (or less).
• D)differences between the experimental and control groups were so large they could never occur by chance alone.

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