SOLUTION: You want to obtain a sample to estimate a population mean.
Based on previous evidence, you believe the population standard deviation is approximately =39.5.
You would like to be
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-> SOLUTION: You want to obtain a sample to estimate a population mean.
Based on previous evidence, you believe the population standard deviation is approximately =39.5.
You would like to be
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Question 1182660: You want to obtain a sample to estimate a population mean.
Based on previous evidence, you believe the population standard deviation is approximately =39.5.
You would like to be 90% confident that your estimate is within 10 of the true population mean.
How large of a sample size is required?
Do not round mid-calculation.
n= Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! for 90% CI; error=z(0.95)*sigma/sqrt(n)
10=1.645*39.5/sqrt(n); square both sides
100=2.706*1560.25/n
n=42.22 round to 43.
