Scatterplots, like the ones below, visualize the value of two properties for a group of items.
A dot represents an item, while the dot's position indicates the value of the two properties depicted by the x-axis and y-axis.

Different items could be members of different groups, such that the color of the dot in the scatterplot indicates the group the item is a member of.
A scatterplot can visualize items in any number of groups, such as:

If, for each group, we draw an ellipse around the majority of the dots in the group and hide the actual dots, as in the diagrams below, then we can easily note where the different groups lie in the scatterplot:

The same data points, and thus groups, as those above can be visualized by the following scatterplots, where only the design (e.g., dot size and opacity) is different from those above:

On the next pages, you have to identify the image with ellipses that matches the given scatterplot with respect to the depicted groups. Once you click on the button with your answer, the correct answer will be shown. Note that if you get most of these training questions wrong, you will not be allowed to proceed with the job and you will not get paid.