In addition to creating groups of equal size,an advantage of block randomization is that it

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Block randomization helps balance potential confounding variables that occur during the time in which an experiment is run. This means that any variables that could potentially affect the outcome of the experiment are equally distributed among the different conditions, increasing the internal validity of the study. Block randomization does not decrease the number of participants needed, average the effect of the dependent variable or hold constant the time in which the experiment is run.

In Addition to Creating Groups of Equal Size,an Advantage of Block