The level of lead in the blood was determined for a sample of 152 male hazardous-waste workers ages 20–30 and also for a sample of 86 female workers, resulting in a mean ± standard error of 5.5 ± 0.3 for the men and 5.5 ± 0.3 for the women (“Temporal Changes in Blood Lead Levels of Hazardous Waste Workers in New Jersey, 1984–1987,” Environ. Monitoring and Assessment, 1993: 99–107). Calculate an estimate of the difference between true average blood lead levels for male and female workers in a way that provides information about reliability and precision.
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