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Chapter 1: Problem 9

A series of studies showed that the people of Denmark and the people of Greenland have vastly different rates of cancer. The reason for this difference is that Greenlanders eat large amounts of cold-water fish, while Danes rarely do. These fish contain a polyunsaturated fatty acid thought to inhibit cancers. Therefore, if the Danes were to eat more cold-water fish, they would reduce their risk for cancer. All of the following statements, if true, would strengthen the above conclusion EXCEPT: A. Greenlanders who ate cold-water fish sparingly had cancer rates nearly the same as the Danes. B. Per capita, Danes and Greenlanders use tobacco with equal frequency.

Short Answer

Expert verified
Both statements A and B strengthen the conclusion indicating the effectiveness of cold-water fish consumption in decreasing cancer risk. The question did not provide a statement that would not strengthen the conclusion.

Step by step solution

01

Analysis of Statement A

Statement A is, 'Greenlanders who ate cold-water fish sparingly had cancer rates nearly the same as the Danes.' This suggests that reduced consumption of cold-water fish induces chances of cancer, aligning with the argument that fish consumption is linked to cancer prevention. Thus, statement A strengthens the conclusion.
02

Analysis of Statement B

Statement B is, 'Per capita, Danes and Greenlanders use tobacco with equal frequency.' It suggests that tobacco usage, a known factor for causing cancer, is the same among both Danes and Greenlanders. So, the variable of fish consumption becomes more potent in explaining the difference in cancer rates. Thus, statement B also strengthens the conclusion.

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