Tests & Measurements, Chapter 3

On a two-dimensional graph, the point on the Y axis where X equals 0.

The difference between predicted and observed values from a regression equation.

The evidence that a test score corresponds to an accurate measure of interest.

A picture of the relationship between two variables. For each individual, a pair of observations is obtained, and the values are plotted in a two-dimensional space created by variables X and Y.

The best-fitting straight line through a set of points in a scatter diagram, found by using the principle of least squares.