A researcher asks if study time (in hours) predicts test performance (0-100). She asked students to report study time prior to giving an exam. She obtained the following data:

Standard deviation of test performance: 11.00 Correlation between study time and test performance: 0.70

Compute the standard error of the estimate using the formula above.

What do you conclude about predicting test performance with study time? Is it an improvement over predicting test scores with the mean test score? Why or why not?