How do you calculate change in concentration of a specific subset of a population?

How do you calculate change in concentration of a specific subset of a population?
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Statistics can be a bear, right? Whenever you’re doing percentage work, make sure you keep asking yourself what the percentage is OF—that is, this figure represents X% of what? Here you need to figure out concentration—so if I have 20 students and 1 of them is Pacific Islander, how would I figure out the concentration of the Pacific Islander students in the population? Once you have the concentrations for each year, then you need to figure out a way to compare the concentrations each year (hint: that’s really, really, easy). You’re close in thinking percent change, but remember, what is that figure a percentage of? There you’re looking at the percentage increase of minority students between the two years—but the percentage doesn’t have any relation to the larger population. Not really what you’re looking for.
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