Of the 1742 managers and professionals polled by Management Recruiters International, May 2002, 27.8% work late 5

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Of the 1742 managers and professionals polled by Management Recruiters International, May 2002, 27.8% work late 5 days a week on average.

Using a 99% confidence interval for the true binomial proportion based on a random sample of 1742 binomial trials and an observed proportion of 0.278, estimate the proportion of managers and professionals who work late 5 days a week.

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