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Vanguard would like to estimate the proportion of privately traded companies that automatically enroll their employees in a 401k retirement plan. Assume that the desired

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Vanguard would like to estimate the proportion of privately traded companies that automatically enroll their employees in a 401k retirement plan. Assume that the desired margin of error is 0.03 for a 95% confidence interval. How large a sample should be selected if no planning value for the proportion could be specifed

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