A researcher studying the effect of a dietary supplement on sleep finds that research participants who take the supplement sleep an average of 8 hours and 25 minutes per night, while participants who were given a placebo pill with no active ingredients in it sleep for an average of 6 hours and 20 minutes. These findings are likely

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The difference between the two groups (8 hours and 25 minutes vs 6 hours and 20 minutes) is statistically significant, which means it is unlikely to have occurred by chance alone. In addition, the difference of more than two hours of sleep per night is also clinically significant, as it could have significant health benefits for individuals who are struggling with sleep difficulties. Therefore, option D, clinically significant, is the best choice.

A Researcher Studying the Effect of a Dietary Supplement on Sleep