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Quality Quiz:Professor Cleary
Another quiz from Professor Cleary

Congratulations: "B" is correct!

Jan's good intentions have indeed gone awry, applying Rule #2 of the "funnel experiment" of W. Edwards Deming by adjusting the process to X-bar. This experiment demonstrated natural variability in a process by using a funnel to drop small beads on a target. If the funnel never moved, these beads would reflect variation, since no two would fall in exactly the same position.

If, on the other hand, the funnel is adjusted after each drop, the process would reflect increased variability. What Jan is doing reflects Rule #2, "At drop k (k = 1,2,3.), the bead will come to rest at point Z, measured from target. Move the funnel distance - Z from its last position." (See Deming, W. Edwards, Out of the Crisis, page 327.  Cambridge, MA: MIT Press, 1982.)

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