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    FlightStats data on Flights; Drying time of four Paints

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    Please provide a detailed solution to both problems so that I know how you arrived at the answer. Thanks

    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.

    11. Four different paints are advertised as having the same drying time. To check the manufacturer's claims, five samples were tested for each of the paints. The time in minutes until the paint was dry enough for a second coat to be applied was recorded. The following data were obtained.

    Paint 1 Paint 2 Paint 3 Paint 4
    128 144 133 150
    137 133 143 142
    135 142 137 135
    124 146 136 140
    141 130 131 153

    At the .05 level of significance, test to see whether the mean drying time is the same for each type of paint.

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