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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 6 inches. The

Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 6 inches.

The heights of 8 randomly selected students are 71, 73, 69, 72, 68, 72, 66 and 62.

Margin of error at 90% confidence level =

90% confidence interval = [ , ]

Smaller value, larger value

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