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 |