DDT is a pesticide banned in the United States for its danger to humans and animals. In an experiment on the impact of DDT, six rats were exposed to DDT poisoning and six rats were not exposed. 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 follows:
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 [Math Processing Error] be the mean nerve sensitivity for rats poisoned with DDT. Let [Math Processing Error] be the mean nerve sensitivity for rats not poisoned with DDT. The P-value is:___________.
A. larger than 0.10.
B. between 0.10 and 0.05.
C. between 0.05 and 0.01.
D. below 0.01.