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Confidence Intervals ion Start Suppose the mean height in inches of all 9th grade students at one high school is estimated The population standard deviation is 3 inches. The heights of 9 randomly selected students are 67, 62, 71, 66 71, 65, 74 61 and 74 I = EXIN2.34 Margin of error at 99% confidence level = Ex. 1.23 99% confidence interval = [ Ex: 12.34 Ex: 12 34 Ismaller value, larger value] 7 Check