What is a best fit line? How is a best fit line useful? What is a best fit line? A. It is a line that connects the leftmost and rightmost data points on a scatterplot. B. It is a line that lies closer to the data points than any other possible line. C. It is a line that connects the bottommost and topmost data points on a scatterplot.

A best fit line, also known as a trend line or line of best fit, is essentially the line that minimizes the distance to all data points in a scatterplot, making it the most representative of the overall pattern of the data. By using methods like least squares, this line can succinctly summarize the relationship between two variables, making predictions more straightforward. In the real world, a best fit line is crucial in fields like economics, biology, and social sciences, as it helps analysts visualize correlations and trends in data. For instance, businesses use it to predict sales based on past performance, while scientists apply it to understand relationships in experimental data. It's like having a crystal ball that gives you insights into future outcomes based on historical data!