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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 6 inches. The

Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 6 inches. The heights of 7 randomly selected students are 71, 75, 72, 65, 65, 60 and 69. x = Margin of error at 99% confidence level = 99% confidence interval = [

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