Blood returning to the mammalian heart in a pulmonary vein drains first into the a. left atrium. b. right atrium. c. left ventricle. d. right ventricle.
General Psychology PSY 1013-04 Experimentation I. Experimentation Have to prove cause and effect A research method which an investigator manipulates one or more factors (Independent variables) to observe the effect on some behavior or mental process (dependent variable). Experimental group in an experiment, the group exposed on the treatment. Control group in an experiment, the group not exposed to the treatment; contrasts with the experimental group and serves as a comparison for evaluating the effect of the treatment. Random Assignment assigning participants to experimental and control