Pearson Product Moment Correlation

Describes the direction and strength of relationship, doesn't get larger with sample size and it doesn't change with scale.

Will never get larger than 1, nor smaller than a -1. The closer to 1 or -1, the stronger the relationship. No relationship is 0.

2 things to know:

  1. algebraic sign (+/-) tells us direction
  2. size of number tells us strength