An experimenter wanted to compare the effects of four chemicals A, B, C, and D on water hardness. Hard water from three different locations was used in the study, but the location of hard water was considered a nuisance in the study. RCBD would be used to analyze the data. Analyze the data and test for differences between the chemicals. Test at 5% level of significance. 

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Chemicals Location A B C D 123 10.1 11.4 9.9 12.1 2 12.2 12.9 12.3 13.4 3 11.9 12.7 11.4 12.9