Question: A tire manufacturer would like to know if there are differences in the tread wear of a tire on the following road surfaces: concrete, asphalt, brick, and gravel. To assure uniformity, the wear on only the right front tire was measured (in millimeters). Seven test runs were made on concrete, 8 on asphalt, 9 on brick, and 6 on gravel. The following, partially completed ANOVA table was produced. Using α = 0.10, can it be concluded that there is a significant difference in the tread wear of a tire on those road surfaces? When answering this problem, don't forget to (a) state H0 and HA, (b) state the critical value or values, (c) compute the test statistic, and (d) make a decision and state your conclusion in the context of the problem.

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