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3. For the specified margin of error, confidence level, and educated guess for the observed value of the sample proportion, obtain a sample size that will ensure a margin of error of at most the one specified (provided, of course, that the observed value of the sample proportion is further from 0.5 than the educated guess). margin of error = 0.04; confidence level = 95%; educated guess = 0.5 Click here to viewpage 1 of the table of areas under the standard normal curve." Click here to view page 2 of the table of areas under the standard normal curve. n= 1200 (Round up to the nearest integer.)