GrimSurfer
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Expected results are an acceptable part of science. They are called hypotheses.
Expectation bias comes into play when the scientist looks for findings (or ways to obtain same) that coincide with expected results. Expectation bias also comes into play when somebody "chooses" that which aligns with their expectations.
Any good scientist should be trying to prove the null hypothesis with equal vigor as trying to prove the hypothesis. A good audiophile should at least be aware of expectation bias and try their best not to fall victim to it.