(f) According to the evidence from this experiment, which of these sources of variation needs to be...
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(f) According to the evidence from this experiment, which of these sources of variation needs to be taken into account when obtaining an estimate of the mean strength of samples of Portland cement?
The breakers in this experiment were human assistants who operated the testing machine, and the variation in the results that they produce is due to personal factors in their preliminary adjustment of the machine.
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