A researcher wishes to estimate, with 95% 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 2% 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 34% 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 34% 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? A. Having an estimate of the population proportion has no effect on the minimum sample size needed. B. Having an estimate of the population proportion raises the minimum sample size needed. C. Having an estimate of the population proportion reduces the minimum sample size needed.
A researcher wishes to estimate, with 95% 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 2% 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 34% 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 34% 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? A. Having an estimate of the population proportion has no effect on the minimum sample size needed. B. Having an estimate of the population proportion raises the minimum sample size needed. C. Having an estimate of the population proportion reduces the minimum sample size needed.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
A researcher wishes to estimate, with
95%
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
2%
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
34%
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
34%
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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