A large body of research points to the conclusion that psychotherapy works. Researchers have carried out literally hundreds of studies examining the effects of psychotherapy. The strategy used to analyze these diverse studies is , in which, as we have seen, the researcher statistically combines the results of many different studies.

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.

answer; john stuart mill's principle of utility is your answer; /// good luck

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