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Blocking Variable

Definition

A blocking variable is a factor that is used to create homogeneous groups in an experiment, ensuring that each group has similar characteristics. It helps control for potential confounding variables and reduces variability within the groups.

Analogy

Think of a blocking variable as dividing students into study groups based on their previous academic performance. By creating homogeneous study groups, it ensures that each group has similar abilities and reduces the impact of individual differences on the outcome of the study.

Related terms

Confounding Variable: A confounding variable is an extraneous factor that affects both the independent and dependent variables, making it difficult to determine their true relationship.

Randomization: Randomization refers to the process of assigning participants or treatments to different groups in an experiment using chance alone. It helps ensure unbiased results and minimize systematic errors.

Control Group: A control group is a group in an experiment that does not receive any treatment or intervention. It serves as a baseline for comparison with the experimental group(s).