If we generate data for this relationship, the Pearson correlation is 0! Visually inspect your plot for a pattern and decide whether there is a linear or non-linear pattern between variables.
Pearson Correlation - Formula If we want to inspect correlations, we'll have a computer calculate them for us.
It measures the monotonic relationship between two variables X and Y.
A sample correlation coefficient is called r, while a population correlation coefficient is called rho, the Greek letter ρ.
Correlation measures the strength of association between two variables as well as the direction.
The illustration below shows an example in Googlesheets.