If the number of blocks in the experiment is larger than 5,the Friedman rank test statistic can be approximated by a chi-square distribution.

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This statement is true. When the number of blocks in the experiment is greater than 5, the Friedman rank test statistic can be approximated by a chi-square distribution with degrees of freedom equal to the number of treatments minus 1.

If the Number of Blocks in the Experiment Is Larger