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5. We are planning to study the relationship between pesticide exposure and asthma (outcome). We want to know how many total subjects are needed to

5. We are planning to study the relationship between pesticide exposure and asthma (outcome). We want to know how many total subjects are needed to detect a relative risk of 2.0 with 90% power using a two-sided test at a 5% significance threshold. We will have twice as many cases as compared to controls and have estimated that 40% of our target population is exposed to pesticides.

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