Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 5 inches. The heights of 6 randomly selected students are 67, 68, 75, 69, 68 and 65. * = Ex: 12.34 Margin of error at 99% confidence level = Ex: 1.23 %3D 99% confidence interval = [ Ex: 12.34 Ex: 12.34 %3D (smaller value, larger valuel
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**CHALLENGE ACTIVITY**
**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 5 inches. The heights of 6 randomly selected students are 67, 68, 75, 69, 68 and 65.
\[
\overline{x} = \text{Ex: 12.34}
\]
Margin of error at 99% confidence level = \[ \text{Ex: 1.23} \]
99% confidence interval = \[ [ \text{Ex: 12.34} - \text{Ex: 1.23}, \text{Ex: 12.34} + \text{Ex: 1.23} ] \]
\[ \text{[smaller value, larger value]} \]
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