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A randomized block design is a statistical technique used to control for variability among experimental units by grouping them into blocks based on a specific characteristic. Within each block, treatments are randomly assigned to ensure that the effects of the treatments can be isolated from the variability among blocks. This design enhances the precision of the experiment by reducing the impact of confounding variables, leading to more reliable comparisons of treatment effects. It is particularly useful when the experimental units can be divided into homogeneous subgroups.

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