Chapter 12.1, Problem 3E

The sample data below represent the number of late and on time flights for Delta, united, and US airways (Bureau of Transportation Statistics, March 2012).

Airline

Flight	Delta	United	US Airways
Late	39	51	56
On Time	261	249	344

1. a. formulate the hypotheses for a test that will determine if the population proportion of late flights is the same for all three airlines.
2. b. Conduct the hypothesis test with a .05 level of significance. What is the p-value and what is your conclusion?
3. c. Compute the sample proportion of late flights for each airline. What is the overall proportion of late flights for the three airlines?