A college registrar is studying the effect of length of commute (in miles) and gender on the number of absences per semester in the students' first registered M-W-F class of the day. Here are the mean numbers of absences per semester in the first registered M-W-F class of the day for each group:

a. What are the independent variables? What is the dependent variable?
b. How many main effects can there be in this study? How many interaction effects can thee be?
c. Express the design in words.
d. Express the design in symbols.
e. Graph the group means.
f. Create a table for the group means.
g. Does there appear to be a main effect? If so, for which independent variable(s)? Explain your decision.
h. Does there appear to be an interaction effect? Explain your decision.

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Commute Miles Gender No. of Absences 10 11-20 20 410 11-20 >20 Male Male Male Female Female Female 1.9 2.2 2.8 1.3 1.6 2.1