Sound Levels Are Measured at Random Moments Under Typical Driving

Multiple Choice

Sound levels are measured at random moments under typical driving conditions for various full-size truck models. The ANOVA results are shown below. $$\begin{array} { l r r r } & \text { Mean } & \text { Std Dev } & \text { n } \\\text { Big Bruin } & 57.44 & 8.944 & 6 \\\text { Gran Conto } & 56.5 & 6.361 & 8 \\\text { MaxRanger } & 64.51 & 3.983 & 7 \\\text { Oso Grande } & 54.15 & 4.166 & 10 \\\text { Overall } & 57.73 & 6.824 & 31 \\& & & \\\text { Source } & \text { SS } & \text { d.f. } & \text { MS } \\\text { Between } & 462.4 & 3 & 154.1 \\\text { Within } & 934.70 & 27 & 34.6 \\\text { Total } & 1,397.10 & 30 &\end{array}$$ The test statistic for Hartley's test for homogeneity of variance is:

A) 2.25.
B) 5.04.
C) 4.61.
D) 4.45.