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Scatter diagram
A graph of paired (bivariate) data points plotted on an $x$-$y$ plane to investigate the relationship between two variables.
When describing a scatter diagram, you should comment on:
These descriptions must be interpreted in the context of the variables (for example, "as study time increases, test score tends to increase").
When there is reasonable correlation, you can draw a line of best fit (also called a trend line) to represent the overall linear relationship.
Line of best fit
A straight line drawn through the middle of a scatter plot so that points are (roughly) evenly distributed above and below it, used to model and predict relationships.
Key qualitative features when drawing a line of best fit by eye:
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