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.