The level of lead in the blood was determined for a sample of 152 male hazardous-waste workers age 20-30 and also for a sample of 86 female workers, resulting in a mean±standard error of5.1±0.3 for the men and3.4±0.2 for the women. 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. (Use a 95% confidence interval. Round your answers to two decimal places.)
Interpret the interval.We are 95% confident that the true average blood lead level for male workers is greater than that of female workers by an amount outside the confidence interval.We are 95% confident that the true average blood lead level for male workers is less than that of female workers by an amount within the confidence interval.We are 95% confident that the true average blood lead level for male workers is greater than that of female workers by an amount within the confidence interval.We cannot draw a conclusion from the given information.