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Data on 4400 college graduates show that the mean time required to graduate with a bachelor's degree is 5.65 years with a standard deviation of

Data on 4400 college graduates show that the mean time required to graduate with a bachelor's degree is 5.65 years with a standard deviation of 1.15 years. Use a single value to estimate the mean time required to graduate for all college graduates. Also, find the 95% confidence interval for the mean time required to graduate for all college graduates.

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