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A highway safety institution conducts experiments in which cars are crashed into a fixed barrier at 40 mph. In the institute's 40-mph offset test, 40%

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A highway safety institution conducts experiments in which cars are crashed into a fixed barrier at 40 mph. In the institute's 40-mph offset test, 40% of the total width of each vehicle strikes a barrier on the driver's side. The barrier's deformable 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. Click the icon to view the data table. (c) Test the hypothesis that the mean head injury for each vehicle type is the same at the a = 0.01 level of significance. Use technology to find the F-test statistic for this data set. Fo =(Round to three decimal places as needed.) Determine the P-value and state the appropriate conclusion below. Since the P-value is , there is evidence to reject the null hypothesis. Thus, we conclude that the means are different at the a = 0.01 level of significance. (Round to four decimal places as needed.) (d) Draw boxplots of the three vehicle types to support the results obtained in part (c). Choose the correct graph below. Head injuries O A. O B. Cars SUVS Large Family Cars Passenger Vans Midsize Utility Vehicle SUVs Vans 264 147 225 Vans 133 238 217 Cars 413 342 186 100 300 500 700 100 300 500 700 529 699 310 Head Injury Head Injury 148 554 355 626 474 557 168 321 395

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