| http://www.w3.org/ns/prov#value | - If so, since h is a factor that varies within groups, we would have: 1 SD of between group difference = 2 SD of within group difference = 2 SD of difference in (h) or that the mean number of hours of homework done by African-American students is equivalent to the number of hours done by the white lower 2.2 percent.
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