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Please answer the question for part A and part B 10.7 Hemoglobin. Hemoglobin levels in 11-year-old boys vary according to a Normal distribution with o

Please answer the question for part A and part B

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10.7 Hemoglobin. Hemoglobin levels in 11-year-old boys vary according to a Normal distribution with o = 1.2 g/dL. (a) How large a sample is needed to estimate mean u with 95% confidence so the margin of error is no greater than 0.5 g/dL? (b) How large a sample is needed to estimate u with margin of error 0.5 g/dL with 99% confidence

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