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 7 randomly selected students are 70, 69, 71, 63, 74, 69 and 75. Ex: 12.34: Margin of error at 99% confidence level = Ex: 1.23 99% confidence interval = [Ex: 12.34 Ex: 12.34 1 [smaller value, larger value]

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