hospital wants to estimate the percentage of admitted patients who receive  Medicare benefits. If we want to estimate that percentage based on  examination of randomly selected patient payment records, how many  patient records must be examined in order to be 90% confident that we are  within four percentage points of the population percentage?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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A hospital wants to estimate the percentage of admitted patients who receive 
Medicare benefits. If we want to estimate that percentage based on 
examination of randomly selected patient payment records, how many 
patient records must be examined in order to be 90% confident that we are 
within four percentage points of the population percentage? 

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