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I don't get how I can calculate the sample size from multiple groups

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I know how to calculate with one group but I'm confused with having multiple groups, I couldn't wrap my head around it.
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Wouldn’t each group use the same percentage? Since they give you the total sample size required it would be:
Group Sample = (minimum total sample / total population)*group population = (2450/10679)*group population
Or roughly 23% of each group
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Suppose one school was 10% of the population.

Then to keep things in proportion, you'd want their sample to be 10% of the sample, which would be 245. So you'd sample 245 students from that school.

Can you generalize that idea?

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