Continuing from the data in Problem 11.14, the travel strategist now selects another sample of flights traveling the same distance, between New York and Houston. In addition to the four seasons of the year, he also records the time of the day in which each flight departed (morning or afternoon). The data is stored in Delay2.

At the 0.05 level of significance,

a. is there an interaction between season and departure time?

b. is there an effect due to season?

c. is there an effect due to departure period?

d. Plot the mean delay for each season for each departure period.

e. What can you conclude about the effect of season and departure period on mean delay?

Problem 11.14

A transportation strategist wanted to compare the delay in the arrival of the flights across airports and seasons. The file Delay contains delay times in the arrival of 15 randomly selected flights at John F. Kennedy international airport, New York, and William P. Hobby Airport, Houston, across each of the four seasons of the year: winter, spring, summer, and fall.