SOLUTION: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=46.2. You would like to

Question 1100116: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=46.2. You would like to be 90% confident that your estimate is within 3 of the true population mean. How large of a sample size is required?

Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
90% CI half interval is 1.645+/-sigma/sqrt(n)
3=1.645*46.2/sqrt(n)
square both sides
9=5775.85/n
n=641.76 or 642

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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 &#963;=46.2. You would like to

SOLUTION: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=46.2. You would like to