Below question I need the answer with steps.

(a) Suppose an analyst in the airline industry carried out a study to determine whether there is a difference in the cost per mile of airfares in a particular country between 1980 and 2014. The data in Table Q5(a) represents the costs per mile of airline tickets for a sample of 17 cities in this country for both 1980 and 2014. City Year 1980 Year 2014 A 20.3 22.8 B 19.5 12.7 18.6 14.1 D 20.9 16.1 E 19.9 25.2 18.6 20.2 19.6 14.9 H 23.2 21.3 21.8 18.7 20.3 20.9 19.2 22.6 19.5 16.9 OOZE 18.7 20.6 17.7 18.5 21.6 23.4 22.4 21.3 20.8 17.4 Table Q5(a) (1) State the null and alternative hypothesis. (11) At a = 5 %, using the normal approximation, carry out a Wilcoxon signed rank test to determine whether there is any significance difference in the cost of airline tickets between 1980 and 2014