2. 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. a. Formulate the hypotheses and test for a significant increase in the mean domestic airfare for business travel for the one-year period. b. What is the sample mean domestic airfare for business travel for each year? c. Calculate the standard deviation for d (5a) Current Previous i d. Calculate the test statistics e. What is the p-value? Using a .05 level of significance, f. What is the percentage change in the airfare for the oneyear period? g. what is your conclusion