Head Injury Crash Test Data Exercises 1–4 use chest deceleration data for three different size categories (small, midsize, large). The data are from a standard crash test and they are listed in Data Set 13 in Appendix: Data Sets. If we use the head injury measurements

(in HIC, which is a standard head injury criterion) with the same three size categories, we get the XLSTAT results shown here. Using a 0.05 significance level, test the claim that the three size categories have the same mean head injury measurement. Does the size of a car appear to affect head injuries?

XLSTAT Analysis of variance: Source DF Sum of squares Mean squares F Pr> F Model 2 7366.952 3683.476 0.161 0.852 Error 18 411540.286 22863.349 Corrected Total 20 418907.238