Question: Chest deceleration in a car crash: New cars were purchased and crashed at 35 mph. The chest deceleration of the dummies is given below. Use a 0.05 significance level to test the null hypothesis that the different weight categories have the same mean. Do the data suggest that larger cars are safer?

Subcompact: 55 47 59 49 42

Compact: 57 57 46 54 51

Midsize: 45 53 49 51 46

Full-Size: 44 45 39 58 44