MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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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
Check Mark
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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