DS 1 1.2.3 gives a data set of brightness measurements for b = 7 batches of kaolin

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DS 1 1.2.3 gives a data set of brightness measurements for b = 7 batches of kaolin processed through k = 3 calciners. The calciner operators are interested in whether their calciners are operating at different efficiencies. What would you advise them? Perform hand calculations.
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