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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 5 inches. The

Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 5 inches. The heights of 10 randomly selected students are 71, 68, 75, 65, 69, 75, 68, 66, 63 and 61.

x =

Margin of error at 90% confidence level =

90% confidence interval = [ , ]

[smaller value, larger value]

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