What does the line of best fit describe in a scatter plot?

• A. The general relationship between the two data sets
• B. The exact average of the data
• C. The highest and lowest values only
• D. A line that passes through all data points

Answer: (A)

The line of best fit captures the general relationship between the two variables shown in a scatter plot. It shows the overall trend: whether the data tend to increase together, decrease together, or show little to no pattern. The line is drawn to reflect this pattern, smoothing over individual points rather than matching every single point exactly. It isn’t the exact average of the data, and it doesn’t have to pass through all the data points; instead, it represents the best overall direction and how one variable tends to change as the other changes. You can use it to get a sense of the typical relationship and to make rough predictions by looking at where a corresponding x-value would place on the line.