Answer: Meta analysis
Explanation: Meta analysis refers to a research strategy which can be adopted for use on research studies which have a large compilation of many different research results on a particular subject or domain. Meta analysis involves the synergy of existing research studies in other t come up with a single conclusion or result which will often yield a more robust, precise and accurate assessment of the subject or topic being analyzed. When a series of distinct analysis have been carried out on a subject or effect of a treatment, a meta analysis if the subject or experiment can be performed by combining the result of all the different distinct researches to produce one single, more coherent conclusion.