please also answer if this is an improvement over predicting test scores with the mean test score and why or why not

Sy = Sy V1 -72 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: 0.50 Compute the standard error of the estimate using the formula above. Your