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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

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 10 randomly selected students are 72 , 66 , 69 , 61, 68 , 69 , 60 , 62 , 74 and 62 . x = Margin of error at 90% confidence level = 90% confidence interval =

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