A researcher wishes to estimate, with 9595% confidence, the population proportion of likely U.S. voters who think Congress is doing a good or excellent job. Her estimate must be accurate within 22% of the true proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 1818% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b).
A researcher wishes to estimate, with 9595% confidence, the population proportion of likely U.S. voters who think Congress is doing a good or excellent job. Her estimate must be accurate within 22% of the true proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 1818% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b).
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
Related questions
Question
A researcher wishes to estimate, with
9595%
confidence, the population proportion of likely U.S. voters who think Congress is doing a good or excellent job. Her estimate must be accurate within
22%
of the true proportion.(a) No preliminary estimate is available. Find the minimum sample size needed.
(b) Find the minimum sample size needed, using a prior study that found that
1818%
of the respondents said they think Congress is doing a good or excellent job.(c) Compare the results from parts (a) and (b).
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