What is meant by the phrase 'the extraneous purposes and values of the machine'?
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Extraneous variables are any variables that you are not intentionally studying in your experiment or test. When you run an experiment, you’re looking to see if one variable (the independent variable) has an effect on another variable (the dependent variable). In an ideal world you’d run the experiment, check the results, and voila! Unfortunately…like many things in life…it’s a little more complicated that than. Other variables, perhaps ones that never crossed your mind, might influence the outcome of an experiment. These undesirable variables are called extraneous variables.
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