x-y correlation or scatter plot are statistical tools that are used to describe the degree of relationship between the variables given. In an x-y correlation, there is a factor called coefficient of correlation which describes this relationship. The coefficient ranges from -1 to 1. A strong correlation with almost linear trendline from the scattered plot has a coefficient of equal to 1. Positive correlation entails positive slope while a negative correlation shows a downward slope 1. When r = 0, then the data forms random distribution in which no correlation is drawn. The closer r is to 1 or -1 and farther from 0, then the better the correlation.
