In employing the randomised block design, the primary interest lies in reducing the within-treatments variation in order to make easier to detect differences between the treatment means.

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This is true. The randomised block design groups experimental units into blocks based on similarities, and then randomly assigns treatments within the blocks. This reduces the within-treatments variation by accounting for any variation among the experimental units within each block. By reducing this variation, differences between the treatment means become clearer and easier to detect.

In Employing the Randomised Block Design, the Primary Interest Lies