Check the denominator before the headline
Distinguish a falling total from improving efficiency.
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The Researcher · fictional example
The situation
A workshop used 900 litres for 60 items on Monday and 800 litres for 40 items on Tuesday. The Researcher is asked to announce that the workshop became more efficient.
Before you continue
What would you predict? Say it aloud or write a line on paper. Then compare your reasoning with the example.
Starting knowledge: Divide one number by another.
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