#4. A professor was interested in discovering the effect of incentives on employee performance. He went back through every issue of The Journal of Applied Psychology and the Journal of Management and statistically combined the results reported in all of the relevant articles. The mean effect size (d) of .63 indicated that incentives did increase employee performance. (a) What type of study is this? (1 point) (b) What is good about this kind of study? (1 point)