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 α = 5%.   Compact cars Midsize cars  Full-size cars   643 469 484   655 427  456   702  525  402 Mean  666.67 473.67 447.33 Standard deviation 31.18 49.17  41.68

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