What sample size is needed

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A political pollster wants to estimate the proportion of voters who will vote for the Democratic candidate in a presidential campaign. The pollster wants to have 90% confidence that their prediction is correct to within +- .04 of the population proportion.

a. What sample size is needed?

b. If the pollster wants to have 95% confidence what sample size is needed?

c. If she wants to have 95% confidence and a sampling error of +-.03, what sample size is needed?

d. On the basis of your answers to a, b, and c, what general conclusions can be reached about the effects of the confidence level desired and the acceptance sampling error on the sampling size needed?

Reference no: EM132394794

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