Posted by **need help** on Wednesday, April 6, 2011 at 4:12pm.

Question 1

A school psychologist reports that the mean number of hours the students at this school sleep each night is 8 hours. The students believe the mean is not 8 hours. To find an estimate of the true mean, they select a random sample of 15 students from their school and ask how many hours each slept last night.

A stemplot and boxplot of the numbers of hours are shown here.

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