Within the relational approach, the regression technique is used to describe relationships by drawing what on past data?

• A. Draw a trend line on past data
• B. Use a set of leading economic indicators
• C. Build a regression model with explanatory variables
• D. Use expert opinion

Answer: (A)

In this approach, regression is used to describe how variables relate by visualizing that relationship with a trend line drawn through past observations. The trend line captures the overall direction and rate of change between the variables, giving a simple, interpretable summary of their relationship and a basis for predicting future values. It’s the natural visualization of the regression idea: a single line that best represents how one variable tends to move as the other changes.

Using a set of leading economic indicators would introduce separate signals rather than illustrate the direct relationship between the chosen variables. Building a regression model with explanatory variables goes beyond just drawing a line—it's about specifying and estimating the full equation with multiple predictors. Relying on expert opinion is not data-driven.