Correlation and line of best fit

Change how strongly two variables are linked and see the scatter graph, Pearson's r, r² and the least-squares line of best fit.

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Questions students ask

What does Pearson's r measure?

The strength and direction of a straight-line relationship, from −1 (perfect negative) to +1 (perfect positive).

Does correlation prove causation?

No. Two variables can move together because a third one drives both.

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