Remember: Independent Variable (IV) = What the investigator manipulates; the particular treatment or condition the investigator thinks is causing something Dependent Variable (DV) = What is measured or observed; the "data" collected in the experiment and the effect of the IV Experimental Group (EG) = Those participants exposed to the independent variable Control Group (CG) = Those participants treated just like the experimental group EXCEPT they are not exposed to the independent variable; the group with which the experimental group can be compared 1) Of 100 individuals with moderate depression, 50 receive 8 weeks of a new cognitive- behavioral therapy, while the other 50 are placed on a waiting list for 8 weeks. At the end of the 8 weeks all 100 are given psychological tests to assess their level of depression. IV: DV: EG: CG: 2) A biopsychologist is studying the effects of anabolic steroids on the aggressive behavior of female rats. 24 female rats receive daily injections of a placebo (fake drug), while 24 others receive daily injections of the steroid. Round-the-clock videotapes of the communal cages of all rats allow all aggressive encounters to be counted and timed. IV: EG: DV: CG: 3) An industrial psychologist is interested in whether lowering the temperature in a packing room will increase productivity (number of products packed). Workers in two equivalent packing rooms participate in the study. One room is maintained at 65 degrees, the other room is left at the usual company temperature of 76 degrees. IV: EG: DV: CG: 4) A social psychologist is interested in whether people will enjoy a video game more if they are paid for playing it. IV: EG: DV: CG: