Test whether the mean pressure applied to the driver’s head during a crash test is equal for each type of car.

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).

 

 

b) Using the hypothetical data provided above, test whether the mean pressure applied to the driver’s head during a crash test is equal for each type of car. Use α =5%.