Question: 4. A banner on the U.S. Airways website recently proclaimed that the airline was again number one in on-time departures. An airline flight departure is considered on-time if it departs less than 15 minutes beyond its scheduled departure time. Southwest Airlines is one of U.S. Airways’ chief competitors in Phoenix.

1. In a random sample of 500 U.S. Airways flights departing Phoenix Sky Harbor Airport in January 2008, 401 departed on-time. A similar sample of Southwest Airlines flights showed 359 departing on-time. At the .01 level of significance, is there evidence that the proportion of U.S. Airways flights departing on-time is significantly greater than the proportion of Southwest Airlines flights departing on-time?

Price: $2.99

Solution: The downloadable solution consists of 2 pages
Deliverable: Word Document