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May 27, 2015

Homework Help: statistics

Posted by looking for someone to varify my work please on Tuesday, April 6, 2010 at 4:24pm.

Question:
A standard placement test has a mean of 105 and a standard deviation of = 13. Determine the minimum sample size if we want to be 99% certain that we are within 3 points of the true mean.

Answer:
N = ( zc /E)^2
= (2.575 x 13/3)^2
= 121

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