Two manufacturing facilities produce 1280 1024 LED (light-emitting diode) displays. Twelve shipments are tested at random

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

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Defects in Randomly Inspected LED Displays Facility Lab A 422 319 326 410 393 368 497 381 515 472 423 355 Number of Bad Pixels per billion Lab B 497 421 408 375 410 489 389 418 447 429 404 477