What meta-analysis does

Here’s a quick example:

Let’s say you’re an educator and you want to know who performs better in graduate school tests – students who came to grad school straight from college or those who worked first?

You go to a graduate school and ask for the test scores from each class. Here’s what you get from the school:

  Students with work experience Students without work experience
 Class Average Score # of students in class Average Score # of students in class
A 83 15 80 5
B 70 5 79 15
C 92 10 86 10

How do you use this information to answer your question?