DrJames Is Considering a New Therapeutic Technique,but Is Unsure as to Its

Dr.James is considering a new therapeutic technique,but is unsure as to its effectiveness.She decides to conduct an extensive review of studies conducted in the last 20 years that have examined this particular therapy tool.After much work and a few calculations,she determines that the average person who received this treatment had a more favourable outcome than 85 percent of people who did not receive the treatment.Dr.James is conducting a meta-analysis study,and the percentage that she calculated is known as the ________________ statistic.

A) correlation
B) common factors
C) effect size
D) treatment factor