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A 95% Confidence Interval for the Mean Lead Concentration in the Urine

Question 30

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A 95% confidence interval for the mean lead concentration in the urine of adult men working with lead (for smelting) is 8.22 to 11.98 micrograms per liter ( μ g/l). The numerical value of the margin of error for this confidence interval is __________μ g/l.

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