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Example
A simple random sample of ten voltage levels
is obtained. Construction of a confidence
interval for the population standard deviation 
requires the left and right critical values of 2
corresponding to a confidence level of 95%
and a sample size of n = 10. Find the critical
value of 2 separating an area of 0.025 in the
left tail, and find the critical value of 2
separating an area of 0.025 in the right tail.
Copyright © 2010, 2007, 2004 Pearson Education, Inc. All Rights Reserved.
7.1 - 94
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