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In respect to this, what is researcher effect in research?

The Hawthorne effect (also referred to as the observer effect) is a type of reactivity in which individuals modify an aspect of their behavior in response to their awareness of being observed. This can undermine the integrity of research, particularly the relationships between variables.

Similarly, what is a research bias? Research bias, also called experimenter bias, is a process where the scientists performing the research influence the results, in order to portray a certain outcome.

Keeping this in consideration, how can researchers reduce effects?

Record what the participants actually say, not what you think they mean. Avoid trying to interpret the data during the study. Double-check your data coding, data entry and any statistical analysis. Ask a research colleague to read your final report, or presentation slides, and give critical feedback.

What is the best research method for Cause and effect?

One of the main strengths of experimental research is that it can often determine a cause and effect relationship between two variables. By systematically manipulating and isolating the independent variable, the researcher can determine with confidence the independent variable's causal effect on the dependent variable.