1 Matching Annotations
- Apr 2024
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pmejournal.org pmejournal.org
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p = 0.04 means there is only 4% probability of observing this 5-point difference (in either direction) between the two groups if in fact there was no difference between the groups (i.e., the null hypothesis that the difference is zero). In other words, there is only 4% probability that the differences found between the two groups were just due to chance (i.e., they are not “true differences”).
These descriptions of a p-value are erroneous. Should be 5 point difference or more; and the p-value is not the probability the difference was "just due to chance". See items #2 and #9 of "Statistical tests, confidence intervals, and power: A guide to misinterpretations". The American Statistician, 70, https://www.jstor.org/stable/44851769
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