How to calculate the needed sample with statcrunch

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How to calculate the needed sample with statcrunch? I tried but did not know the weight. Hemoglobin levels in 11-year-old boys vary according to a normal distribution with σ=1.2 g/dL.

a) How large a sample is needed to estimate µ with 95% confidence so the margin of error is no greater than 0.5 g/dL?

Reference no: EM132514811

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