What is bias in an experiment?

a process where the scientists performing the research influence the results, in order to show a certain result

An experimental bias can be define as the type of variable which is selectively chosen so as to obtain a desired result. It can also be said that a bias can be any kind of manipulation which is done by the experimenter so as to obtain a desired outcome or findings of the experiment. An experimenter can also take the advantage of choosing the desired samples from the collection of samples.

To avoid bias, a blinded study can be used in which the random variables as well as no bias while collecting the samples for study takes place.