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.

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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Airline Did It Flv? Yes No American 48 52 Continental 69 41 Delta 68 62 United 25 35 Total 210 190 li