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a rigorous investigation of a causal hypothesis requires manipulation of the independent variable and control of extraneous variables keeping them all the same across conditions this type of experimental study requires a large amount of control control over the setting and circumstances under which the research is conducted this is why a lot of experimental research is done in a laboratory or lab the experimental method combined with the control that a lab setting offers maximizes internal validity now in the social sciences a lab isnt a room full of test tubes and microscopes its simply an environment thats entirely under the researchers control a lab room could be a small room with no distracting features just a comfortable chair and a desk with a computer so that participants can perform for example a computerized intelligence test without distraction and all under the same conditions or it could be a room with soft carpeting colorful pillows and toys fitted with cameras to recor
