Research indicates that paying students to improve their grades simply does not work (Fryer, 2011). However, paying students for specific tasks such as reading books, attending class, or doing homework does have a significant effect. Apparently, students on their own do not understand how to get good grades. If they are told exactly what to do, however, the incentives work. The following data represent a two-factor study attempting to replicate this result.

a. Use a two-factor ANOVA with a = .05 to evaluate the significance of the main effects and the interaction.
b. Calculate the h2 values to measure the effect size for the two main effects and the interaction.
c. Describe the pattern of results. (How does paying for grades influence performance? How does paying for homework influence performance? Does the effect of paying for homework depend on whether you also pay for grades?)

Paid for Not Paid for Homework Homework 14 10 Paid for Grades Not Paid for Grades