Question 1103776
The half confidence interval is z*sqrt(p*(1-p))/n
z=1.96
1.96*sqrt(0.5)(0.5)/922, using 0.5 since that gives the largest sample size and is the most conservative estimate.
3.2% margin of error.
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similarly for b
4.2%
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and for c
2.6%
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the margin of error may be estimated as 1/sqrt(n), since 1.96 * 0.5 is about 1