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April 17, 2014

Homework Help: Beginning of Stats

Posted by Laddi on Monday, December 10, 2012 at 8:45pm.

A study of 50 mathematics professors showed that they spend, on average,12.4 minutes correcting a student's final examinations. Find a 90% confidence interval of the mean time for all mathematics peofessors spend on conrrecting final examinations when standard deviation = 2.2 minutes.

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