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Thirty different medical students tested the blood pressure of the same person. Assume that the population standard deviation is known to be 10 mmHg: a)

Thirty different medical students tested the blood pressure of the same person. Assume that the population standard deviation is known to be 10 mmHg:

a) What would be the margin of error for a 95% confidence interval?

b) If we wanted to have a margin of error of 1mmHg, how big would the sample have to be?

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