Pre study score versus

01:12:23 Time Remaining Return Next 30 1 point Pre-study scores versus post-study scores for a class of 120 college freshman English students were considered. The residual plot for the least squares regression line showed no pattern. The least squares regression line was y = 0.2 + 0.9x with a correlation coefficient r = 0.68. What percent of the variation of post-study scores can be explained by the variation in pre-study scores? 82.4% OO 46.2% O 68.0% 90.0% We cannot determine the answer using the information given. Previous Next 28