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Asked Dec 5, 2019
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If subject 101is 71 years old. Divide the age by 10 and put a % on it, that is your desire margin of error in percentage points. Find the sample size required to develop an 86% confidence interval on a population proportion that will result in that margin error. 

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Za2 n= p(1- p) Here, za2 is the critical value at 86% confidence level, p is the population proportion and E is the margin of error.

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