Zagat surveys fliers on a 30-point scale to gauge their satisfaction with the comfort, service, and food on domestic and international flights. The following average scores for various airlines were collected between September 21 and October 10, 2013. These data can also be found in the Excel file Zagat.xlsx.

Airline Domestic International Alaska 15.6 15.5 American 10.1 11.6 Continental 14.1 15.6 Delta 10.9 12.8 United 10.4 12.0 U.S. Airways 9.1 10.1 Virgin America 21.1 20.7

a. Calculate the Spearman rank-order correlation coefficient.

b. Using a = 0.05, perform a hypothesis test to determine if the population rank correlation coefficient is different than zero.

AppendixLO1