_____ significance in an efficacy or effectiveness study refers to a statistically significant difference between two groups.It is measured quantitatively.

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Statistical significance refers to the probability that the observed difference between two groups is not due to chance alone. It is typically measured using statistical tests such as the t-test or chi-square test. In contrast, clinical significance (choice B) refers to the practical meaningfulness of the observed difference, such as whether it is large enough to have a real-world impact on patients. Theoretical significance (choice C) is not a commonly used term in this context, and control (choice D) refers to a group that does not receive the intervention being studied, rather than a measure of significance.

_____ Significance in an Efficacy or Effectiveness Study Refers to a Statistically