The Global Business Travel Association reported the domestic airfare for business travel for
the current year and the previous year (INC. Magazine. February 2012). Below is a sample of
12 flights with their domestic airfares shown for both years.
sample:
Current Year 345 526 420 216 285 405 635 710 605 517 570 610
Previous Year 315 463 462 206 275 432 585 650 545 547 508 580
(a) Is there evidence of an increase in the mean domestic airfare for business travel for
the one-year period? Use a 0.05 level of significance.
(b) What is the sample mean domestic airfare for business travel for each year?
(c) What is the percentage change in the airfare for the one-year period?
Thank you for helping me with stats!
