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; perform an ANOVA test to determine whether the mean pressure applied to the driver's head during a crash is equal for each type of cars. Use a=5%.

Compact Cars Midsize cars Full-size cars
643 469 484
655 427 456
702 525 402