Tessa conducts an experiment and obtains results that are statistically significant. What is meant by "statistically significant”?

Statistical significance means the observed results would be unlikely if chance alone were responsible, according to a chosen significance threshold. It does not necessarily mean the sample was large, the experiment was unbiased, or participants were randomly assigned; those are separate features of a study. The correct choice is “the results that Tessa obtained are too unusual to be explained by chance alone.”

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