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Two researchers plan to construct a 99% confidence interval for the mean μ of a Normal...

Two researchers plan to construct a 99% confidence interval for the mean μ of a Normal population with (known) standard deviation s.  Researcher A uses a random sample of 50 individuals.  Researcher B uses a random sample of 800 individuals. How does the margin of error for Researcher A’s estimate compare to that of Researcher B’s estimate?

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