A researcher wishes to estimate, with 99% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within3% 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 32% 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 32% 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?○ A. Having an estimate of the population proportion reduces 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 has no effect on the minimum sample size needed.

a) n=1843 b) n=1604 c) Having an estimate of population proportion reduces the minimum sample size…

Answered: A researcher wishes to estimate, with…

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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A researcher wishes to estimate, with 90% confidence, the population proportion of adults 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. (Round up to the nearest whole number asneeded.)
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