One reason why researchers rarely examine whether prevention programs reduce incidence rates is that

Question

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To detect a difference in incidence rates before and after the implementation of prevention programs, researchers often need a very large sample size. This is because the changes in incidence rates can be small and require a large amount of data to statistically confirm. Smaller sample sizes might not provide the statistical power necessary to detect these differences, making large-scale studies essential but also more challenging and resource-intensive to conduct.

One Reason Why Researchers Rarely Examine Whether Prevention Programs Reduce