Suppose the National Transportation Safety Board (NTSB) wants to examine the safety of compact cars, midsize cars, and full-size cars. It collects a sample of three for each of the treatments (car types). Using the hypothetical data provided below, test whether the mean pressure applied to the driver. head during a crash test is not equal for each types of car. Use a = 5%. Compact Cars Midsize Cars Full – size Cars 643 469 484 655 427 456 702 525 402 451 532 623 678 562 711 509 571 488

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