Which r-value is the best estimate of the correlation coefficient for the variables in the scatter plot? An untitled scatter plot with 10 points plotted. Horizontal axis is labeled Variable X and extends from 0 to 8. Vertical axis is labeled Variable Y and also extends from 0 to 6. Plotted points are at begin ordered pair 1.5 comma 4.8 end ordered pair comma begin ordered pair 1.9 comma 3.8 end ordered pair comma begin ordered pair 3.2 comma 4 end ordered pair comma begin ordered pair 3.3 comma 3.2 end ordered pair comma begin ordered pair 3.5 comma 2 end ordered pair comma begin ordered pair 4 comma 3.6 end ordered pair comma begin ordered pair 4.9 comma 2.8 end ordered pair comma begin ordered pair 5.5 comma 2 end ordered pair comma begin ordered pair 6.5 comma 2.6 end ordered pair comma begin ordered pair 7.1 comma 1.8 end ordered pair.