A 95% confidence level for the difference between u1 and u2 runs from -2 to +6. From this we can infer that

Question

a. u1 is probably greater than u2.
b. u1 is probably less than u2.
c. there may be no difference at all between u1 and u2.
d. the difference between u1 and u2 is not very large in any case.