<PRE><B>Question 1056846</B>
Find the sample size needed to estimate the percentage of republicans among registered voters in California. Use a 0.03 margin of error; use a confidence level of 90%. 
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Percentage is a proportion.
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Since E = z*sqrt(pq/n)
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n = (z/E)^2*p*q = (1.645/0.03)^2*(1/2)(1/2) = 752 when rounded up
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Cheers,
Stan H.
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