A highway safety institution conducts experiments in which cars are crashed into

Question

A highway safety institution conducts experiments in which cars are crashed into a forced barrier at 40 mph. In the institute's 40 mph onset test, 40% of the total width of each vehicle strikes barrier on the driver's side. The barriers face is made of aluminum honeycomb, which makes the forces in the test similar to those involved in a frontal offset crash between two vehicles of the same weight, each going just less than 40 mph. You are in the market to buy a family car and you want to know if the mean head injury resulting from this offset crash is the same for large family cars, passenger vans, and midsize utility vehicles (SUVs). The data in the accompanying table were collected from the institute's study Complete parts (a) through (d) below. State the null and alternative hypotheses. H_0: mu_Cars = mu_Vans = mu_SUVs and H_1: at least one mean is different H_0: mu_Cars = mu_Vans = mu_SUVs and H_1 = mu_Cars

Explanation / Answer

Tha answer would be A Because the person wants to know if the mean head injury is same for all the cars.

The null hypothesis may be rejected if any one of them would differ.

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