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— The extent of the likely effect of the play of chance on the results of a study, meta-analysis or measurement

Full explanation:

The greater the imprecision, the greater the likelihood of being misled by the play of chance. A confidence interval around an effect estimate is one way of expressing imprecision, with a wider confidence interval meaning more imprecision. Conversely, a narrower confidence interval means more precision and less likelihood of being misled by the play of chance. Imprecision is a reason for there being less certainty of the evidence for an effect estimate.

See also:

confidence interval  ·  certainty of the evidence

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