Chapter 4 Questions Group 1 Gustavo Alvarado
Question 1 Airline Performance Measures. Ontime arrivals, lost baggage, and customer complaints are three measures that are typically used to measure the quality of service being offered by airlines. Suppose that the following values represent the ontime arrival percentage, amount of lost baggage, and customer complaints for 10 U.S. airlines.
Airline  OnTime Arrivals (%)  Mishandled Baggage per 1,000 Passengers  Customer Complaints per 1,000 Passengers 
Virgin America  83.5  0.87  1.50 
JetBlue  79.1  1.88  0.79 
AirTran Airways  87.1  1.58  0.91 
Delta Air Lines  86.5  2.10  0.73 
Alaska Airlines  87.5  2.93  0.51 
Frontier Airlines  77.9  2.22  1.05 
Southwest Airlines  83.1  3.08  0.25 
US Airways  85.9  2.14  1.74 
American Airlines  76.9  2.92  1.80 
United Airlines  77.4  3.87  4.24 

 Based on the data above, if you randomly choose a Delta Air Lines flight, what is the probability that this individual flight will have an ontime arrival?
 If you randomly choose 1 of the 10 airlines for a followup study on airline quality ratings, what is the probability that you will choose an airline with less than two mishandled baggage reports per 1,000 passengers?
 If you randomly choose 1 of the 10 airlines for a followup study on airline quality ratings, what is the probability that you will choose an airline with more than one customer complaint per 1,000 passengers?
 What is the probability that a randomly selected AirTran Airways flight will not arrive on time?
Answers and explanations:
Part A
The probability that the Delta Airlines flight will have an ontime arrival is 0.865.
Explanation: The obtained probability is 0.865 which indicates that there is approximately 86.5% chances that the Delta Airlines flight will have an ontime arrival.
Part B
The probability that the chosen airline with less than two mishandles baggage reports per 1000 passengers is 0.3.
Explanation: The obtained probability is 0.3 which indicates that there is approximately 30% chances that the chosen airline with less than two mishandles baggage reports per 1000 passengers.
Part C
The probability that the chosen airline with more than one customer complaint reports per 1000 passengers is 0.5.
Explanation: The obtained probability is 0.5 which indicates that there is approximately 50% chances that the chosen airline with more than one customer complaint reports per 1000 passengers.
Part D
The probability that the selected AirTran Airways flight will not arrive ontime is 0.129.
Explanation: The obtained probability is 0.5 which indicates that there is approximately 50% chances that the chosen airline with more than one customer complaint reports per 1000 passengers.