Question

In a medical study involving one hundred pairs of identical twins, one member of each pair tests positive for a particular disease, while the other member of each pair does not. One researcher noted that the average body temperature of those who have the disease is 98.0°, and the average body temperature of those who do not have the disease is 98.3°.The researcher then concludes, "People who have this particular disease have a lower body temperature." Why is this probably not a valid claim?

Answer 1

A. The difference in body temperatures of the two groups is too small to make this claim.
B. Normal body temperature is 98.6°, so the data gathered must be incorrect.
C. The researcher should have studied 100 pairs of twins who both had the disease.
D. The sample size is too large; i.e., the researcher should have studied fewer than 100 pairs of twins.