Final answer:
A scatterplot is an appropriate display for a data set when you want to show the relationship between two variables.
Step-by-step explanation:
A scatterplot is an appropriate display for a data set when you want to show the relationship between two variables. In a scatterplot, each data point is represented as a dot, and the position of each dot on the graph represents the values of the two variables. By plotting the data points on a scatterplot, you can visually see if there is a correlation or trend between the two variables.