The exercise examines the relationship between the destination city (Phoenix and Seattle) and the number of arrivals on time for Alaska and America West Airlines in 1987. Click on Data under Chapter 1 in the left panel and then select Open remote ... under the File menu in the right panel. Select arrivals.xml from the Open File Dialog and click OK. Note that On-time? is assigned the Y role, Destination the X role, and Airline the Z role by default, whereas Freq is assigned the Frequency role. Select xy|z from the Graph menu. Open the contingency table by clicking on the Contingency table sub-menu item in the Plot menu. Note that the values (percentages) in the contingency table change depending on the selected value of the conditioning Airline variable (Alaska or AmerWest). However, you may need to click on the continency table to activate the changes. Use the Display menu items to answer the following questions.