This question: 4 point(s) possible Submit test In recent years, the airline industry has been severely criticized for a variety of service-related issues including poor on-time performance, canceled flights, and lost luggage. Some believe airline service is declining while the price of airline fares is increasing. Have the prices of airline fares changed? Use the sample of 10 average airfares from the third quarters of 2006 and 2007 by city of origin shown in the table below. Answer parts (a) and (b). Click the icon to view the data table. a) Are these data paired? Why or why not? Choose the correct answer below. O A. Yes, because the data for both years are for the same cities of origin during the same time of year and our concern is about whether the price of airline fares has changed. O B. Yes, because both sets of data have the same sample size, each set of data comes from a year, and our concern is about whether the price of airline fares has changed. O C. No, because paired data is represented only by the sum of two values. O D. No, because not all of the data values for one year are greater than all o - X b) Was there a statistically significant change in airfares? Data table Perform a paired t-test on the mean difference. Identify the null and alternative City Third Quarter 2006 Third Quarter 2007 O A. Ho: Hd = 0 204.74 239.89 504.95 HA: Hd > 0 466.91 151.74 162.25 O C. Ho: Hd # 0 489.79 521.74 COCO VOUI A WN- 405.44 428.98 HA: Hd = 0 204.85 161.85 342.61 291.54 Calculate the test statistic. 386.67 336.52 389.29 355.73 Let "Third Quarter 2007" -"Third Quarter 2006" be the difference. 10 331.96 309.46 t = (Round to two decimal places as needed.) Calculate the P-value. Print Done