The XLSTAT display below results from using the one-way analysis of variance test with the three samples.
a. What is the null hypothesis?
b. Assuming a 0.05 significance level, what conclusion is indicated by the displayed results?

Refer to the following list of departure delay times (min) of American Airline flights from JFK airport in New York to LAX airport in Los Angeles. Assume that the data are samples randomly selected from larger populations.

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XLSTAT Sum of Mean Source DF squares squaresF Pr> 01 4263.0833 2131.5417 1.9104 0.1729 Flight 3 Flight 19 19 Flight 2118 0 3 8 8 -4 -4 73 60 142 47 13