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 46% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b).
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 46% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b).
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Statistics Question 27
Transcribed Image Text: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 46% of the respondents said they think
Congress is doing a good or excellent job.
(c) Compare the results from parts (a) and (b).
(a) What is the minimum sample size needed assuming that no prior information is available?
n= (Round up to the nearest whole number as needed.)
(b) What is the minimum sample size needed using a prior study that found that 46% of the respondents said they think
Congress is doing a good or excellent job?
n= (Round up to the nearest whole number as needed.)
(c) How do the results from (a) and (b) compare?
O A. Having an estimate of the population proportion raises the minimum sample size needed.
B. Having an estimate of the population proportion has no effect on the minimum sample size needed.
C. Having an estimate of the population proportion reduces the minimum sample size needed.
O
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