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Three professors (a physicist, a chemist, and a statistician) are called in
to see their dean. Just as they arrive the dean is called out of his office,
leaving the three professors there. The professors see with alarm that there is
a fire in the wastebasket.
The physicist says, "I know what to do! We must cool down the materials until
their temperature is lower than the ignition temperature and then the fire will
go out."
The chemist says, "No! No! I know what to do! We must cut off the supply of
oxygen so that the fire will go out due to lack of one of the reactants."
While the physicist and chemist debate what course to take, they both are
alarmed to see the statistician running around the room starting other fires.
They both scream, "What are you doing?"
To which the statistician replies, "Trying to get an adequate sample
size."