Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they\'re supposed to staple a set of papers). Group A is given the special juice

Simply look at the results of each group and see which did better and this will give an indication of whether the juice helped, but the conclusion can only be drawn if the same two sets of people are set the task when the set is free of the influence of the juice too and the difference offset.

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