Question: (10 points) 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 data in Airline. MTW show a sample of 400 scheduled flights during the snowstorm. Use the chi-square test of independence with a 0.05 level of significance to analyze the data.

1. Give the null and alternative hypothesis.
2. Give the test statistic.
3. Give the P- value.
4. Give the decision of this test.
5. What can we conclude from this significance test?

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