Suppose that a random sample of 200 entering students in 2000 showed 74% were still enrolled 3 years later. Another random sample of 200 entering students in 2010 showed that 66% were still enrolled 3 years later. This constitutes an 8% change in 3-year retention rate. However, the 8% difference is based on random sampling, and is only an estimate of the true difference. What is the margin of error of the estimation with 95% confidence? A. 0.34% OB. 7.51% C. 8.95% OD. 4.57% OE. 2.46%

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