Question 1140011: A report in a research journal states that the average weight loss of people on a certain drug is 28 lbs with a margin of error of ±2 lbs with confidence level C = 95%.
(a) According to this information, the mean weight loss of people on this drug, μ, could be as low as ???
lbs.
(b) If the study is repeated, how large should the sample size be so that the margin of error would be less than 1 lbs? (Assume σ= 8 lbs.)
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! It could be as low as 26 pounds or as large as 30 pounds.
for 1 pound take this approach
1=1.96*8/sqrt(n)
sqrt(n)=1.96*8
square both sides, n=(1.96*8)^2=245.86 or 246
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