z-score 2) A college teacher asked a random sample of 10 of the 250 students in her introductory statistics class to record the total amount of time (in hours) they spent studying for a particular test and then combined these times with the students' scores on the test. She then performed a regression analysis on the data. Below is numerical and graphical output from her computer software. Prodictor Constant Cocf SE Coof T P 62.100 4.093 12.69 0.000 Study Time 12.000 2.825 4.25 0.003 3- 7.73709 R-3q - 69.3% R-3q(adj) - 65.1% Grade 70 60 Scatterplot of Grade vs Study I ime 100 90- 50 0.0 0.5 10 1.5 Study Time 20 2.5 3.0 Normal Probability Plot of Residuals 10 19 Residual 5 in -10 -15 -15 0 O.D . 2 Residuals Residual Plot 50 05 1.0 15 Study Time 2.0 2.5 3.0