Answered: A poll reported 31% support for a…

A poll reported 31% support for a statewide election with a margin of error of 1.36 percentage points. How many voters should be sampled for a 90% confidence interval? z*=1.645 (critical value)

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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Question

A poll reported 31% support for a statewide election with a margin of error of 1.36 percentage points. How many voters should be sampled for a 90% confidence interval?

z*=1.645 (critical value)

Expert Solution

Step 1: Given data :

Sample proportion( $straight p with hat on top$ )=0.31

Margin of error(E)=0.0136

Critical value(Z^*)=1.645

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