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Calculating sample size using proportion

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If the proportion of people who intend to vote Democratic were to be estimated at a 95% confidence level, what sample size should be taken?

a. if the accuracy is to be +- 0.01
b. if the accuracy is to be +- 0.03
c. if the accuracy is to be +- 0.06

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The expert calculates the sample size using proportions.

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What sample size should be taken?
If the proportion of people who intend to vote Democratic were to be ...

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