3. 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 (cars types). Using the hypothetical data provided below, test whether the mean pressure applied to the driver's head during a crash test is equal for each types of car. Use a - 5%. Compact cars 643 Midsize cars Full-size cars 469 427 525 484 655 702 SSbetween 86,049.55 456 402 SSwithin - 10,254

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A:

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