Final answer:
The statement is True. A key component of meta-analysis is the calculation of an effect size index.
Step-by-step explanation:
The statement is True.
A key component of meta-analysis is the calculation of an effect size index. Effect size measures the magnitude of the relationship between variables in a study, and it is important in determining the practical significance of the findings. It helps to summarize the findings across multiple studies and allows researchers to make comparisons and draw conclusions.
For example, in a meta-analysis on the effectiveness of a certain medication, the effect size index could be calculated to determine how much improvement the medication provides compared to a placebo or an alternative treatment.