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A sample of size 60 is drawn from a population whose distribution is approximately normal. The standard deviation of the selected sample is 5.5. Find

A sample of size 60 is drawn from a population whose distribution is approximately normal. The standard deviation of the selected sample is 5.5. Find the margin of error for a 99% confidence interval for . (between these answers) 1.83 1.17 1.39 1.89

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