SOLUTION: Researchers want to estimate the mean weight of all chipmunks living in Albuquerque, NM. Using the population standard deviation of 1.4 ounces as in Question #5, find the sample si
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Question 273154: Researchers want to estimate the mean weight of all chipmunks living in Albuquerque, NM. Using the population standard deviation of 1.4 ounces as in Question #5, find the sample size required if we want our margin of error to be less than 0.25 ounces with 95% confidence. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Researchers want to estimate the mean weight of all chipmunks living in Albuquerque, NM. Using the population standard deviation of 1.4 ounces as in Question #5, find the sample size required if we want our margin of error to be less than 0.25 ounces with 95% confidence.
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Since E = z*s/sqrt(n)
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sqrt(n) = zs/E
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n = [zs/E]^2
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Your Problem:
n = [1.96*1.4/0.25]2
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n = 120.47
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Rounding up:
n = 121
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Cheers,
Stan H.
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