A lab experiment is a type of research method in which the researcher can exert ____ levels of control over what happens as part of the experimental process. The researcher ____ the environmental factors, such as noise and temperature (possible ____ variables) so that the effects of the ____ variable upon the ____ variable can be observed and measured. Lab experiments use a ____ procedure to ensure replicability and reliability. All variables are kept the ____: only the independent variable changes between conditions. The experiment is run in the same room/space per ____ The researcher treats the participants in the ____ way (e.g. tone of voice, body language, clothing) per condition

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