Use the information for Exercise 11.20.
a. Which class had the highest sample mean number of TV hours, and which class had the lowest sample mean? (1 is for freshman, 2 is for sophomore, and so on.)
b. Write out the null and alternative hypotheses for the effect of class on TV hours.
c. Identify the F-value from the output.
d. Assuming that you found an association between class and TV hours, would that show that class caused the different levels of TV hours? Explain.