All examples in this Bongard Problem are scatter plots. Each dot represents a data point.
"Positive correlation" means that when the X value increases, the Y value tends to increase as well (in the long run), while "negative correlation" means that when the X value increases, the Y value tends to decrease.
CROSSREFS
Adjacent-numbered pages:
EXAMPLE
Example TM4854 does not fit on either side because when the X value increases, the Y value stays the same.
Example TM4855 does not fit on either side because there is no correlation.