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Question 1. 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? b) How large a sample is needed to estimate µ with margin of error 0.5 g/dL with 99% confidence?

Question

1.      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?

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b)     How large a sample is needed to estimate µ with margin of error 0.5 g/dL with 99% confidence?

 
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