Opinion or bias can cause the outcome of an experiment to be incorrect because it’s based off of a personal preference. That being said, any desirable outcome can be produced. One example of this would be human reproduction. Let’s say a person of Cuban race wants a mixed child. They would decide not to marry a Cuban spouse because it’s biased that the offspring will be only one race. Therefore, they would marry a person of a different race to provide a desirable outcome, which in this case, would be a biracial child. Bias leans a result toward one side, preferably the result desired. That’s how opinions and biases can cause the outcome of experiments to be incorrect.