But how about if I have % of A, % of B, % of C etc? Should I treat them as % of A and NOT A %, then % of B and NOT B? Can I calculate margin of error when I have multiple proportions? Thank you beforehand!

- Thread starter Yermy
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But how about if I have % of A, % of B, % of C etc? Should I treat them as % of A and NOT A %, then % of B and NOT B? Can I calculate margin of error when I have multiple proportions? Thank you beforehand!

%C = 100% - %A - %B. So you might imagine that moeC = sqrt(moeA^2+moeB^2). But the same applies to %B and %A...?

Very strange. But the suggestions above will probably give reasonable results.