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I don't understand this Suppose the mean height in inches of all 9th grade students at one high school estimated. The population standard deviation is

I don't understand this

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Suppose the mean height in inches of all 9th grade students at one high school estimated. The population standard deviation is 5 inches. The heights of 7 randomly selected students are 63, 66 61, 69, 74, 62 and 69 D = Ex: 12.34: Margin of error at 95% confidence level = Ed 1.23 95% confidence interval = [ Ex: 12 34| | Ex. 12 34 ] [smaller value, larger value) Check Next

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