What type of data does a scattergram display?

A scattergram, also known as a scatter plot, is specifically designed to display the relationship between two numerical variables. By plotting points on a two-dimensional graph, where each axis represents one of the variables, a scattergram allows for the visualization of correlation or trends between these variables. The positions of the points indicate how one variable may change in relation to another, making it a powerful tool for identifying patterns, trends, or potential outliers in data sets.

Numerical data showing relationships is crucial for various analyses, including regression analysis, trend identification, and forecasting. The insight gained from a scattergram can guide decision-making in numerous fields, from business to scientific research, by revealing how variables interact and influence each other over a range of values. Thus, the correct answer accurately captures the primary function and purpose of a scattergram in data analysis.