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%.
Added by Sebastian B.
Step 1
The formula for calculating the sample size needed to estimate a population proportion is: n = (Z^2 * p * q) / E^2 where: n = sample size Z = z-score corresponding to the desired confidence level (in this case, 1.645 for 90% confidence level) p = estimated Show more…
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