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Unformatted text preview: is called a
confidence interval for .
The sample size is
deviation is given as Chapter 7 : Confidence
Intervals and S ample S ize
S ection 7 .1 : Confidence
Intervals for the Mean
W hen sigma is Known Ex erc is e: Find the
c onfidenc e interval for the
mean when s igma is k nown
Su p p le me n ta ry Re s o u rce s , and the population standard
. According to the central limit theorem, because the sample size is large, the sample mean
and standard deviation follows (approximately) a normal distribution with mean .
Thus, the v...
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- Winter '12