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.(b) Find the minimum sample size needed, using a prior study that found that 36% 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.)

Given: margin of error, E= 0.02

Answered: (a) No preliminary estimate is…

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) 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 36% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b).