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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 2 inches. The

Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 2 inches. The heights of 10 randomly selected students are 69, 62, 66, 68, 69, 75, 61, 72, 70 and 75.

x =

Margin of error at 95% confidence level =

95% confidence interval =

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