Organic arsenicals are used by forestry personnel as silvicides. The amount of arsenic that is taken into the body when exposed to these silvicides is a major health problem. It is important that the amount of exposure be determined quickly so that a field worker with a high level of arsenic can be removed from the job. In an experiment reported in the paper, "A Rapid Method for the Determination of Arsenic Concentrations in Urine at Field Locations," published in the Amer. Ind. Hyg. Assoc. J. (Vol. 37, 1976), urine specimens from 4 forest service personnel were divided equally into 3 samples so that each individual could be analyzed for arsenic by a university laboratory, by a chemist using a portable system, and by a forest employee after a brief orientation. The following arsenic levels, in parts per million, were recorded. Perform an analysis of variance and test the hypothesis, at the 0.05 level of significance, that there is no difference in the arsenic levels for the 3 methods ofanalysis.

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Analyst Individual Employee Chenmist Laboratory 0.05 0.05 0.04 0.04 0.05 0.05 3 0.04 0.04 0.17 0.15 0.10