15. FlightStats, Inc., collects data on the number of flights scheduled and the number of flights flown at major airports throughout the United States. FlightStats data showed 56% of flights scheduled at Newark, La Guardia, and Kennedy airports were flown during a three-day snowstorm (The Wall Street Journal,February 21, 2006). All airlines say they always operate within set safety parameters-if conditions are too poor, they don't fly. The following data show a sample of 400 scheduled flights during the snowstorm.
Did It Fly? American Continental Delta United Total
Yes 48 69 68 25 210
No 52 41 62 35 190
Use the chi-square test of independence with a .05 level of significance to analyze the data. What is your conclusion? Do you have a preference for which airline you would choose to fly during similar snowstorm conditions? Explain.
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