18 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 pattern. The least squares regression line was y = 0.2 + 0.9: with a correlation coefficient r = 0.68. What percent of the variation of post-study scores can be explained by th variation in pre-study scores? 68.0% 46.2% 90.0% 82.4% O We cannot determine the answer using the information given. Previous Next