KA researcher wishes to estimate, with 95% confidence, the population proportion of adults who think Congress isdoing 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 26% of the respondents said they thinkCongress 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?(Round up to the nearest whole number as needed.)(b) What is the minimum sample size needed using a prior study that found that 26% of the respondents said theythink 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?n=O 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.OC. 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 adults who think…

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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(6) A student surveys some students on campus in the evening and finds that 16 out of 20 of the students she interviewed are part time students. She uses the data to estimate the percentage of all students who are part time. What type of bias is present in her sample?
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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 26% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b).