It is very easy to introduce experimental bias because the experimenter already knows that the milk is past its expiration date.
Experimental biases refer to the tendency to introduce biases into experiments or influence the results of experiments in a particular way. It is an attribute that could be possessed by experimenters.
Experimental biases could be of different forms:
Self-fulfilling bias has to do with the expectations of the researcher influencing their observations. Observer's bias occurs when observer's expectations influence how they observe. Subject bias has to do with the expectations of the subjects of experiments.
In this case, the researcher knowing already that the milk is already past its expiration date could influence how they see things during the experiment. In other words, the prior knowledge of the expiration status of the milk may eliminate objective analysis of the results.
More on experimental biases can be found here: https://brainly.com/question/409188
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