6. Does the Weight of a Car Affect Chest Injuries in a Crash? Data were obtained from car crash experiments conducted by the National Transportation Safety Administration.

New cars were purchased and crashed into a fixed barrier at 35 mi/h, and the chest deceleration data (g) are given below. Use the sample data listed below to test the null hypothesis that the different weight categories have medians that are not all the same. Do the data suggest that heavier cars are safer in a crash?

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