Three Different Brands of Tires Were Compared for Wear Characteristics

Essay

Three different brands of tires were compared for wear characteristics. For each brand of tire, 10 tires were randomly selected and subjected to standard wear testing procedures. The average mileage obtained for each brand of tire and sample standard deviations (both in 1000 miles) are shown below. $\begin{array}{ccc}&\text { Brand } \mathrm{A} & \text { Brand } \mathrm{B} & \text { Brand } \mathrm{C} \\\text { Average mileage }&37 & 38 & 33 \\\text { Sample variance }&3 & 4 & 2\end{array}$ Use the above data and test to see if the mean mileage for all three brands of tires is the same. Let α = .05.