Posted by **kathy** on Monday, July 30, 2012 at 9:31am.

The National Center for Education surveyed 4400 college graduates about the lengths of time required to earn their bachelor's degrees. The sample mean is 5.15 years, and assume that standard deviation is known to be 1.68 years. Based on the sample data, construct the 99% confidence interval for the mean time required by all college graduates. Also determine the margin of error, E.

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