The manager at the Sacramento, California, airport recently conducted a study of passengers departing from the airport. A random sample of 100 passengers was selected. The data are in the file called Airline Passengers. An earlier study showed the following usage by airline:

Delta 20%

Horizon 10%

Northwest 10%

Skywest 3%

Southwest 25%

United 32%

a. If the manager wishes to determine whether the airline usage pattern has changed from that reported in the earlier study, state the appropriate null and alternative hypotheses.

b. Based on the sample data, what should the manager conclude? Test using a significance level of 0.01.