three blocks of coal were analyzed by four chemists and the ash-content in the block was found to be under

blocks chemists

1 11 111 1V

A 18 15 15 17
B 17 16 14 14
C 13 16 15 14
DO THE blocks differ in their ash-content?do the chemists differ significantly their analysis?also identify the following
2.Experimental unit
5.Experimental error
9.Local control if any

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