Pearson's product moment correlation coefficient (r)

This lesson is intended for the ‘A,’ level statistics students. The lesson clearly describes the concept of ‘PPMCC,’ as:
In statistics, the Pearson correlation coefficient (PCC, also referred to as Pearson’s r, the Pearson product-moment correlation coefficient (PPMCC) or the bivariate correlation, is a measure of the linear correlation between two variables X and Y.