Unit 5 Contents

Using the graph to estimate distances which lie between two points on the graph is called interpolation. “Inter-” means between points.

Using the graph to predict distances which lie beyond the data points on the graph is called extrapolation. “Extra-” means beyond or outside the points on the graph.

1. Did you use interpolation or extrapolation to estimate the winning time in 1955?
2. Did you use interpolation or extrapolation to predict the winning time in 2005?
3. Which is more accurate? Explain.

The Using Best-Fit Lines pages in the Student Activity Book provide more practice with making predictions from graphs.