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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

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 8 randomly selected students are 62, 64, 67, 68, 68, 61, 75 and 72.

x =

Margin of error at 99% confidence level =

99% confidence interval = [ ] [ ]

[smaller value, larger value]

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