Effect size: In statistics, the term "effect size" is described as a "quantitative measure" associated with the magnitude of any of the "experimenter effect". However, it has been described that the longer effect size would describe the stronger relationship that exists between two different variables and vice versa. Therefore, a researcher tends to look for the effect size whenever he or she trying to compare two different groups in order to see the degree to which these two different groups differ from each other.
In the question above, the given statement represents the effect size.
