.1 Road Rage. "The phenomenon of road rage has been frequently discussed but in- frequently examined." So begins a report based on interviews with 1382 randomly selected drivers. The respondents' answers to interview questions produced scores on an "angry/threatening driving scale" with values between 0 and 19. What driver characteristics go with road rage? There were no significant differences among races or levels of education. What about the effect of the driver's age? Here are the mean responses for three age groups: 55 yr 2.22 1.33 0.66 The report says that F = 34.96, with P < 0.01. (a) What are the null and alternative hypotheses for the ANOVA F test? Be sure to explain what means the test compares. (b) Based on the sample means and the F test, what do you conclude?