Compared to a between-subjects design, the variance in a within-subjects design is greatly reduced because the are measured and statistically removed.

individual differences

Explanation:

According to my research on the design methods mentioned, I can say that based on the information provided within the question the variance in a within-subjects design is greatly reduced because the individual differences are measured and statistically removed. This is because in within-subjects design differences are studied among subjects who are in the same group.

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