A researcher wishes to estimate, with 99% 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 4% of the true proportion. (a) No
A researcher wishes to estimate, with 99% 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 4% of the true proportion. (a) No
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 8E
Related questions
Question
A researcher wishes to estimate, with
99%
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
4%
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
22%
of the respondents said they think Congress is doing a good or excellent job.(c) Compare the results from parts (a) and (b).
Question content area bottom
Part 1
(a) What is the minimum sample size needed assuming that no prior information is available?
n=enter your response here
(Round up to the nearest whole number as needed.)Part 2
(b) What is the minimum sample size needed using a prior study that found that
22%
of the respondents said they think Congress is doing a good or excellent job?n=enter your response here
(Round up to the nearest whole number as needed.)Part 3
(c) How do the results from (a) and (b) compare?
Having an estimate of the population proportion has no effect on the minimum sample size needed.
Having an estimate of the population proportion raises the minimum sample size needed.
Having an estimate of the population proportion reduces the minimum sample size needed.
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