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Answer on Statistics and Probability Question for Dion

Question #17338
If the standard deviation of a national accounting examination is 900, how large a sample is needed to estimate the true mean score within 5 points with 99% confidence?
Expert's answer
Variance = 900
Standard deviation = 30
z(alpha) = 2.575
error = 5
n = ( z(alpha) * SD /error)² = ( 2.575 * 30 / 5 )² = 238.7025
sample of 239 is needed.

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