Dr James Is Considering Learning a New Therapeutic Technique, but Is

Dr. James is considering learning 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) treatment factor
D) effect size