Question: Suppose we eventually plan to accumulate 50 MI cases during the period 2000-2005. Assume that the 24-hour case-fatality rate is truly 20% during this period.

Suppose we eventually plan to accumulate 50 MI cases during the period 2000-2005. Assume that the 24-hour case-fatality rate is truly 20% during this period. How much power would such a study have in distinguishing between case-fatality rates in 1990 and 2000-2005 if a two-sided test with significance level 0.05 is planned?

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