Agent Orange and Vietnam Vets. Agent Orange, the code name for a herbicide developed for the U.S. armed forces in the 1960s, was found to be extremely contaminated with TCDD, or dioxin. During the Vietnam War, an estimated 19 million gallons of Agent Orange was used to destroy the dense plant and tree cover of the Asian jungle. As a result of this exposure, many Vietnam veterans have dangerously high levels of TCDD in their blood and adipose (fatty) tissue. A study published in Chemosphere (Vol. 20, 1990) reported on the TCDD levels of 20Massachusetts Vietnam vets who were possibly exposed to Agent Orange. The TCDD amounts (measured in parts per trillion) in both plasma and fat tissue of the 20 vets are listed in the accompanying table. The data are saved in the TCDD file. Medical researchers are interested in comparing the TCDD levels in fat tissue and plasma for Vietnam veterans. Specifically, they want to determine whether the distribution of TCDD levels in fat is shifted above or below the distribution of TCDD levels in plasma. Conduct this analysis (at α = .05 ) and make the appropriate inference.
Vet | Fat | Plasma |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | 4.9 6.9 10.0 4.4 4.6 1.1 2.3 5.9 7.0 5.5 7.0 1.4 11.0 2.5 4.4 4.2 41.0 2.9 7.7 2.5 | 2.5 3.5 6.8 4.7 4.6 1.8 2.5 3.1 3.1 3.0 6.9 1.6 20.0 4.1 2.1 1.8 36.0 3.3 7.2 2.0 |
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