The Global Business Travel Association (GBTA) reported the domestic airfare business travel for the current year and the previous year. Below is a sample of 6 flights with their domestic affairs (in $) shown for both years. Suppose GBTA wished to see if the average airfare for the current year is less than the average airfare for the previous year at a=.05

For the hypothesis stated above, what is the critical value (in terms of "current" minus "Previous")?

A. -2.015

B. -1.812

C. None of the answers

D. -1.943

E. -1.833