An experimenter conducts an experiments on the effects of a drug to control hallucinations. He declares the results to be "statistically significant,' which usually means that:
Correct answer: C. differences between experimental and control group of this size occur by chance only 5 times out of 100 (or less)
- A. even though appropriate statistics were used, no differences could be detected between experimental and control groups
- B. the results have important implications for theory or practice
- C. differences between experimental and control group of this size occur by chance only 5 times out of 100 (or less)
- D. differences between experimental and control groups were so large they could never occur by chance aloneSupport Disease Research
Explanation
Statistical significance usually means that a difference this large would occur by chance only at or below the chosen probability level, commonly 5 percent. It does not necessarily mean the result is practically important or impossible to obtain by chance.
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