What is the most common type of bias in science?

The most common type of bias in science is confirmation bias, which occurs when researchers favor information or interpretations that confirm their existing beliefs or hypotheses while disregarding evidence that contradicts them. This can lead to flawed conclusions and hinder the objective evaluation of data. Other biases, such as publication bias and selection bias, also play significant roles in distorting scientific findings, but confirmation bias is particularly pervasive across various fields of research.