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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 7 randomly selected students are 66 , 64 , 74 , 60 ,73 , 64 and 60 .

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