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A researcher is interested in estimating the mean time it takes adults to learn a certain task. He wants to be 99% confident that

A researcher is interested in estimating the mean time it takes adults to learn a certain task. He wants to be 99% confident that the mean time for a sample of adults is within 0.3 minutes of . In a small pilot study the standard deviation of learning times was 6.1 minutes. How large a sample of adults should be tested?

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