A large number of exam takers who fail to pass the OCS exam report that the section on research was one of their lowest-scoring sections. Dr. David Smelser discusses research basics as well as statistics and important values you will need to memorize to ace the research portion of the exam. In this episode, David covers levels of evidence, types of variables, p-values and alpha levels, type I and type II errors, effect sizes, Cohen's kappa, and likelihood ratios. And just to keep things interesting, these values are reinforced with real data from studies that could be relevant for the exam.

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