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e intervals for population means
6.2.1: Confidence intervals for population means.
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Suppose the mean height in inches of all 9th grade students at one high school is
estimated. The population standard deviation is 4 inches. The heights of 7
randomly selected students are 67, 66, 72, 69, 60, 68 and 63.
$\bar{x}$ = Ex: 12.34
Margin of error at 90% confidence level = Ex: 1.23
90% confidence interval = [Ex: 12.34 Ex: 12.34 ]
[smaller value, larger value]
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