When testing the null hypothesis, chance can never be completely ruled out.

Name: When testing the null hypothesis, chance can never be completely ruled out.
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Quizplus · Accepted Answer

This is because there is always a possibility of obtaining a rare sample or event purely due to chance, even if the null hypothesis is true. However, statistical testing can help provide evidence for or against the null hypothesis, and determine the level of confidence in rejecting it.

When Testing the Null Hypothesis, Chance Can Never Be Completely