Four observers determine the moisture content of samples of a powder, each man taking a sample from each of six consignments. Their assessments are given below: Observers Consignments 1 2 3 4 5 6 1 2 3 4 9 12 11 12 10 11 10 11 9 9 10 11 10 11 12 14 11 10 11 12 11 10 10 10 Discuss whether there is any significant difference between consignments. (Useful data: Ftab(5,15):2.96, Ftab(3,15):3.29
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