Systematic bias is sampling error that stems from the way in which the research is conducted and can therefore be controled by the researcher. There are three types:

• Selection bias: The way in which the participants are selected, causes a biased view.

• Non-response bias: A biased view arises, because the people that are willing to participate in your study, are different from the people that do not respond in your study.

• Response bias: A biased view arises, because the answers that are given are not in accordance with the truth.