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a survey of 280 homeles persons showed that 63 were veterans. Construct a 85% confidence interval...

a survey of 280 homeles persons showed that 63 were veterans. Construct a 85% confidence interval for the proportion of homeless persons who are veterans

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Answer #1

Given that a survey of N=280 homeles persons showed that X=63 were veterans. So, the sample proportion is calculated as:

and the confidence interval is calculated as:

Zc is the critical value for normal distribution which is calculated using excel formula which is =NORM.S.INV(0.925) which results in Zc as 1.44

Now the confidence interval is calculated as:

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