In the randomised block design,you need to assume that there is NO interaction between the treatments and the blocks.

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The assumption of the randomized block design is that there is no interaction between the treatments and the blocks. This assumption allows for the comparison of treatment effects within each block and helps to increase statistical power and precision in the analysis. If there is an interaction between the treatments and the blocks, then the randomized block design may not be appropriate, and a different experimental design may need to be used.

In the Randomised Block Design,you Need to Assume That There