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

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Block randomization ensures that potential confoundings are distributed evenly among the experimental conditions, thus minimizing their impact on the results. This is particularly useful when certain variables (such as age, gender, or education level) may influence the outcome of the study, but the researcher cannot control them. Therefore, option B is the best choice. The other options are incorrect: A does not make sense since block randomization does not affect the sample size needed in each condition; C is incorrect because block randomization aims to reduce individual differences between conditions, not increase them, and D is incorrect since averaging is not the purpose of block randomization, but rather to ensure equal representation of different factors across conditions.

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