The Global Business Travel Association reported the domestic airfare for business travel for the current year and the previous year. Below is a sample of 12 flights with their domestic airfares shown for both years. Do not round intermediate calculations. Current Year Previous Year   Current Year Previous Year 468 231   285 216 342 282   699 498 552 360   675 255 252 192   702 222 396 375   477 381 234 174   621 357                 What is the p-value? p-value  (to 3 decimals) Degrees of freedom   b. What is the sample mean domestic airfare for business travel for each year? Current Year $  (to 2 decimals) Previous Year $  (to 2 decimals)   c. What is the percentage change in the airfare for the one-year period? % (to 2 decimals)