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I have $5$ different options: ($a,b,c,d,e$) out of which one is correct ($c$ in this case).

What should be the sample size (the number of people I should ask to answer) so that I can get $80\%$ confidence that the correct answer is chosen?

Thanks

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    I think you've used the wrong tag. Distribution theory deals with [distributions](http://en.wikipedia.org/wiki/Distribution_(mathematics)), not with confidence intervals.2011-05-03

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