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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 2 inches. The

Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 2

inches. The heights of 6

randomly selected students are 68

, 73

, 72

, 68

, 63

and 60

.

x

=

Margin of error at 99%

confidence level =

99%

confidence interval = [

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