Ask each student in the class to estimate the length of the classroom. Specify that the length is the distance between the chalkboard and the opposite wall. On the same sheet of paper, each student should also write his or her gender and major. Then divide into groups of three or four, and use the data from the entire class to address these questions:
• Is there a significant difference between the mean estimate for males and the mean estimate for females?
• Is there sufficient evidence to reject equality of the mean estimates for different majors? Describe how the majors were categorized.
• Does an interaction between gender and major have an effect on the estimated length?
• Does gender appear to have an effect on estimated length?
• Does major appear to have an effect on estimated length?