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John is studying ADHD among teenagers, he conducts a poll to estimate the percentage of teenagers aged 14-16 and asks them whether or not they

John is studying ADHD among teenagers, he conducts a poll to estimate the percentage of teenagers aged 14-16 and asks them whether or not they have ever been prescribed medication for ADHD. What sample size should Johnny needs if he wishes to estimate to be within 2.5 percentage points with 90% confidence

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