DDT is a pesticide banned in the United States for its danger to humans and anim

Question

DDT is a pesticide banned in the United States for its danger to humans and animals. In an experiment on the impact of DDT, 6 rats were exposed to DDT poisoning and 6 rats were not. For each rat in the experiment, a measurement of nerve sensitivity was recorded. The researchers suspected that the mean nerve sensitivity for rats exposed to DDT is greater than that for rats not poisoned. The data follow: Poisoned rats: 12.207 16.869 25.050 22.429 8.456 20.589 Unpoisoned rats: 11.074 9.686 12.064 9.351 8.182 6.642 Let be the mean nerve sensitivity for rats poisoned with DDT. Let be the mean nerve sensitivity for rats not poisoned with DDT. Reference: Ref 19-4 The numerical value of the standard error of the difference in sample means is A. 1.30. B. 2.61. C. 4.05. D. 9.02.

Explanation / Answer

B. 2.61

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