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Wisconsin Public Radio wants to duplicate a survey conducted in 2011 that found that 68% of adults living in Wisconsin felt that the country was going in the wrong direction. How many people would need to be surveyed for a 90% confidence interval to ensure the margin of error would be less than 3%. Be sure to show all your work and round appropriately. (4 points)

math   Statistics-And-Probability   
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Answer #1
here margin of error E = 0.030
for90% CI crtiical Z          = 1.645
estimated proportion=p= 0.680
required sample size n =         p*(1-p)*(z/E)2= 655.00

( please revert for any clarification required)

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