Find a meta-analysis published in a journal; two good sources are the Review of Educational Research and Psychological Bulletin. What conclusions were drawn from the meta-analysis? How were studies selected for the analysis? How was the concept of effect size discussed in the meta-analysis?

Meta-analysis is the process of gathering information from many studies conducted on the same topic and interpretation of the same in statistics, which are much more evidence based. Meta-analysis effects the size-based analysis, since it’s a statistical phenomenon.
The given topic of review in education and the psychological bulletin did meta-analysis of all the information gather from other studies in a whole statistics-based result. It’s a systematic view and data collection is the important part of such type of systematic study.
The steps of extracting the data include the pilot study, covering the usefulness of the available data. There is a coding system for the extraction of data for meta-analysis. There is also one guide developed for the complex meta-analysis. With the help of this researcher can count on data that sometime face problems.
The guide does not provide the intense procedure to follow for meta-analysis. It just a helpful hand for the researchers only with the data extraction for meta-analysis process.
Meta-analysis always leads to the exact conclusion for any of the research. One of the main reasons for this that meta-analysis focus on the phenomenon of effect size. It’s the size of the two variables showing to the extent they are related to each other. Effect size is the concept that actually tells us about the way of quantification of differences between the two variables.
Meta-analysis gives importance to the effect size, rather then the sample size for the research study. Effect size is calculated by average of two variables and then dividing the resultant by their standard deviation. If both the variables have similar standard deviation and of same size, then the resultant effect size would be appropriate.