A political pollster wants to estimate the percentage of voters who will vote for the Democratic candidate
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Question:
A political pollster wants to estimate the percentage of voters who will vote for the Democratic candidate in a presidential campaign. The pollster wishes to have 90% confidence that her prediction is correct to within ± 4% 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 a 95% confidence and a sampling error of 3%, what sample size is needed?
Related Book For
Introduction to Statistical Investigations
ISBN: 978-1118922002
1st edition
Authors: Beth L.Chance, George W.Cobb, Allan J.Rossman Nathan Tintle, Todd Swanson Soma Roy
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