SOLUTION: A standard placement test has a mean of 105 and a standard deviation of σ = 13. Determine the minimum sample size if we want to be 99% certain that we are within 3 points of t
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Question 221022: A standard placement test has a mean of 105 and a standard deviation of σ = 13. Determine the minimum sample size if we want to be 99% certain that we are within 3 points of the true mean Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A standard placement test has a mean of 105 and a standard deviation of σ = 13. Determine the minimum sample size if we want to be 99% certain that we are within 3 points of the true mean
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n = [z*sig/E]^2
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invNorm(0.005) = -2.576
n = [2.576*13/3]^2
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n = 124.6
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Round up to n= 125
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