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Question: The May 1, 2007, College Retirement Equity Fund (CREF) prospectus lists the following sample returns on $1 invested in two of the fund's accounts, per year.

Equity Index Account ($):          1.636, 1.441, 0.973, 1.055, 1.400

Money Market Account ($):        1.169, 1.273, 0,976, 0.998, 0.953

Assuming these data are random samples, is there statistical evidence that one account is better than the other?

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