A physicist… an engineer… and a statistician… are out hunting.
Suddenly, out of nowhere, a deer appears… about fifty yards away.
The physicist steps forward. He quickly does some ballistic calculations… assumes a perfect vacuum… adjusts the angle of his rifle… and fires. The bullet lands… five yards short.
The engineer nods. “Ah… you forgot air resistance.”
He adds a little fudge factor… lifts the rifle slightly higher… and fires. This time… the bullet lands five yards long the deer.
And then, the statistician jumps up, throws his hands in the air, and shouts, “We got him!!”