The following sample data were recently collected in the course of conducting a randomized block analysis of variance. Based on these sample data, what conclusions should be reached about blocking effectiveness and about the means of the three populations involved? Test using a significance level equal to 0.05.

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Block Sample 1 Sample 2 Sample 3 40 70 40 40 70 10 10 0 70 30 90 10 30 610) 40 80 20