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Digital Camera Lenses Tests
help me with a math question?
A manufacturing company produces lenses for digital cameras.The defect rate for each lens is 9%.
Which of the following testing procedures will result in more production stops?
Procedure A: The company test 10 lenses per hour, and stops production if 2 or more are defective.
Procedure B: The company test 20 lenses per hour, and stops production if 4 or more are defective
Well, it's not much a math question, but a logic-related question.
Just like any marketing or political poll, the more people you ask, the more precise data you get. Both Procedure A and B have the same defect rates at which the production stops: 20% (10-2/10 = 0.8 for A and 20-4/20=0.8 for B).
But since B is more precise (remember: the more lenses you check, the closer you get to the real defect value: 9%), the results of Procedure B will be closer to 9%, compared to Procedure A.
It means, with Procedure A will result in more production stops, simply because its results are less likely to match the actual value of 9%.
USB Fever Lens Test (Macro + Wide Angle)
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