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.

Question

Quizplus · Accepted Answer

Statistical significance typically means that the observed differences (e.g., in the effects of a drug to control hallucinations between the experimental and control groups) are unlikely to have occurred by chance alone, with a common threshold being a probability of 5% or less (p < 0.05).

An Experimenter Conducts an Experiment on the Effects of a Drug