Question

What does correlation mean in a graph?

Answer 1

Correlation is how well data can be fitted to a line.

Explanation:

Typically data refers to a scatterplot. If the data can be represented by a line and the line has a positive slope, then it has a positive correlation. If the line has a negative slope, then the correlation is negative.

The absolute value of the correlation coefficient `(|r|)` of the line has values from `0 to 1.0`.

The closer `|r|` is to `1.0` the better the data fits the regression line (the line that fits the data best).

In summary: Correlation is how well data can be fitted to a line.