# Question

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?)

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?)

## Answer to relevant Questions

In Chapter 12 (page 390), we described a study reporting that college students who are on Facebook (or have it running in the background) while studying had lower grades than students who did not use the social network ...A published report of a repeated-measures research study includes the following description of the statistical analysis. "The results show significant differences among the treatment conditions, F(3, 21) = 6.10, p , .01." a. ...As we have noted in previous chapters, even a very small effect can be significant if the sample is large enough. Suppose, for example, that a researcher obtains a correlation of r = 0.60 for a sample of n = 10 ...Does the regression equation from problem 21 account for a significant portion of the variance in the Y scores? Use a = .05 to evaluate the F-ratio. For the following scores, a. Sketch a scatter plot and estimate the value of the Pearson correlation. b. Compute the Pearson correlation.Post your question

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