Which of the following is an example of a two-way ANOVA test?

• a.)

  Comparing the number of hours of sleep for freshman, sophomores, juniors, and seniors.

• b.)

  Studying the number of hours of sleep for freshmen, sophomores, and juniors.

• c.)

  Comparing the number of hours that freshman and seniors study during a semester.

• d.)

  Analyzing the number of hours that freshman, sophomores, juniors, and seniors study in a semester as well as the number of hours of sleep each group gets at night.