To verify the hypothesis that blood lead levels tend to be

Chapter , Problem 41

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To verify the hypothesis that blood lead levels tend to be higher for children whose parents work in a factory that uses lead in the manufacturing process, researchers examined lead levels in the blood of 33 children whose parents worked in a battery manufacturing factory (Morton, D., Saah, A., Silberg, S., Owens, W., Roberts, M., and Saah, M., Lead Absorption in Children of Employees in a Lead-Related Industry, American Journal of Epidemiology, 115, 549555, 1982). Each of these children was then matched by another child who was of similar age, lived in a similar neighborhood, had a similar exposure to traffic, but whose parent did not work with lead. The blood levels of the 33 cases (sample 1) as well as those of the 33 controls (sample 2) were then used to test the hypothesis that the average blood levels of these groups are the same. If the resulting sample means and sample standard deviations were .x 1 = .015, s1 = .004, .x2 = .006, s2 = .006 find the resulting p-value. Assume a common variance.