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Question 784:

Two manufacturing facilities produce 1280 1024 LED (light-emitting diode) displays. Twelve
displays are chosen at random from each lab, and the number of bad pixels is noted for each display.
Research question: At α = .05, do the medians differ?

Defects in Randomly Inspected LED Displays

Facility Number of Bad Pixels

Lab A 2 0 5 0 1 2 0 5 0 4 1 2
Lab B 0 1 2 3 1 0 0 1 2 2 1 0

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