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Confidence Interval for
Estimating a Population Mean
(with  Known)
 = population mean
 = population standard deviation
x = sample mean
n = number of sample values
E = margin of error
z/2 = z score separating an area of a/2 in the
right tail of the standard normal
Copyright © 2010, 2007, 2004 Pearson Education, Inc. All Rights Reserved.
7.1 - 53
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Slide 1 -
Slide 1 -
Determining Sample Size
Determining Sample Size