A researcher wishes to​ estimate, with 80​% ​confidence, the population proportion of adults who think Congress is doing an excellent job. Her estimate must be accurate within 2​% of the true proportion. No preliminary estimate is available. Find the minimum sample size needed to accomplish this.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.4: Collecting Data
Problem 5E
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A researcher wishes to​ estimate, with 80​% ​confidence, the population proportion of adults who think Congress is doing an excellent job. Her estimate must be accurate within 2​% of the true proportion. No preliminary estimate is available. Find the minimum sample size needed to accomplish this.

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