Sample-size plan. It is important to develop a detailed plan of study early in the development of

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Sample-size plan. It is important to develop a detailed plan of study early in the development of an investigation in order to assure adequacy of the sample size. Consider a test of H0 : p1 = p2 against Ha :
p1 ≠ p2 at α = 0.05 with a power that is equal to 0.80. We predict that 20% of group 1 and 30% of group 2 will experience the outcome. If we recruit an equal number of individuals in each of the groups, how many individuals do we need to study?

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