(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A candidate wishes to estimate the proportion, among likely voters who would vote for her on election day, with 80% margin of error less than 0.03. What sample size should she use?

Answer: 456

2. Relevant equations

+/- Z[phat*qhat/sqrt(n)], Z = 1.28, phat = 0.5, qhat = 0.5

3. The attempt at a solution

0.03 = 1.28 sqrt[0.5*0.5/n]

0.03/1.28 = 0.5/sqrt(n)

0.0234 = 0.5/sqrt(n)

n = [0.5/0.0234]^2

n = 456

Is the above correct. It matches with the answer 456. I don't know how to delete this question.

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# Homework Help: Stat: estimate proportion

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