=+much larger, but for the purposes of this exercise, we use n1 5 n2 5 n3 5 n4 5 20):

Number of Times Driving Over 80 mph by Musical Preference MainAcoustic/ stream Hard Heavy Pop Rock Rock Metal 2 3 3 4 3 2 4 3 4 1 3 4 1 2 1 3 3 3 2 3 3 4 1 3 3 3 4 3 3 2 2 3 2 4 2 2 2 4 2 4 1 4 3 4 3 4 3 5 2 2 4 4 2 3 3 5 2 2 3 3 3 2 2 4 2 2 3 5 2 3 4 4 3 1 2 2 4 3 4 3 n 20 20 20 20 2.50 2.70 2.75 3.55 s .827 .979 .967 .887 s

2

.6839 .9584 .9351 .7868 x

Also, N 5 80, grand total 5 230.0, and Carry out an F test to determine if these data provide convincing evidence that the true mean number of times driving over 80 mph varies with musical preference.