What is a meta-analysis and how is such a research method useful to demonstrate efficacy of an outcome?

After reading An update on social and emotional learning outcome research, in Module 4: Lecture Materials & Resources, please answer and discuss the following.

In your opinion, are Social and Emotional Learning (SEL) critical to students’ long-term success in and out of school. Please explain.
What is a meta-analysis and how is such a research method useful to demonstrate efficacy of an outcome?
Which of the of the four meta-analyses of SEL program effects provides the most compelling argument in general for SEL effectiveness and why?
Which of the of the four meta-analyses of SEL program effects provides the most compelling argument globally for SEL effectiveness and why?
What is a randomized control trial and why is it important to include these types of studies in a meta-analysis?

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