Critical appraisal is the process of carefully and systematically examining research to judge its trustworthiness, value, and relevance in a particular context.
There are many checklists and tools to help you in carrying out a critical appraisal of evidence:
While this course from Johns Hopkins is aimed at public health, it provides a broad overview of biostatistial methods and concepts, emphasizing interpretation and concepts rather than calculations or mathematical details. It develops the ability to read the scientific literature to critically evaluate study designs and methods of data analysis, and it introduces basic concepts of statistical inference, including hypothesis testing, p-values, and confidence intervals. Topics include comparisons of means and proportions; the normal distribution; regression and correlation; confounding; concepts of study design, including randomization, sample size, and power considerations; logistic regression, and an overview of some methods in survival analysis.