Time to graduation. Data from the National Center for Education Statistics on 4,400 college graduates show that

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Time to graduation. Data from the National Center for Education Statistics on 4,400 college graduates show that the mean time required to graduate with a bachelor’s degree is 5.15 years with a standard deviation of 1.68 years.

Use a single value to estimate the mean time required to graduate for all college graduates. Also, find the 95% confidence interval.

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