Urban traffic congestion throughout the world has been increasing in recent years, especially in developing countries.

The following table shows the number of minutes that randomly selected drivers spent stuck in traffic in various cities on both weekdays and weekends. The data for this problem can also be found in the file traffic.xlsx.

City Beijing New Delhi Mexico City New York Weekday 89 44 56 53 74 113 81 65 119 65 81 38 67 76 99 42 94 97 122 51 Weekend 80 81 35 30 87 26 86 39 69 104 75 44 71 79 66 44 58 77 36 42

a. Using a = 0.05, is there significant interaction between the city and time of the week?

b. Using a two-way ANOVA and a = 0.05, does the city have an effect on the amount of time stuck in traffic?

c. Using a two-way ANOVA and a = 0.05, does the time of the week have an effect on the amount of time stuck in traffic?

d. If warranted, determine which means are significantly different using a = 0.05.

e. Construct an interaction plot for the city and the time of the week.

AppendixLO1