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Mathematics
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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 interval of 90%, and assume p-hat and q-hat are unknown.

Assume that nothing is known about the percentage of on time southwest flights

Assume that for a recent year 84% of southwest flights were on time

Apr 13th, 2015

Sample size n = z^2 x p (1-p) / e^2   to estimate percentage of  Republicans among registered voters in Ca

Here z = 1.645 for 90 % confidence, p =50 , and e = 3

So n= (1.645)^2 x 50 x50/9

        = 751.6.               select next sample size which is 752

Answer: sample size 752


Apr 13th, 2015

I have answered yurt question.

Niru

Apr 13th, 2015

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