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A report in a research journal states that the average weight loss of people on a...

A report in a research journal states that the average weight loss of people on a certain drug is 19 lbs with a margin of error of ±5 lbs with confidence level C = 95%.

According to this information, the mean weight loss of people on this drug, μ, could be as low as ?? lbs.

If the study is repeated, how large should the sample size be so that the margin of error would be less than 2.5 lbs? (Assume σ= 9 lbs.)

Math   Statistics-And-Probability   
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