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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 4 inches. The

Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 4 inches. The heights of 10 randomly selected students are 66, 71, 67, 61, 68, 67, 64, 67, 67 and 70.

Margin of error at 99% confidence level =

99% confidence interval = [ smaller value, larger value ] ?

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