Identifying Variables and Groups
In each of the examples, identify the independent variable and dependent variable as well as which participants make up the experimental group and which make up the control group.
Independent Variable = What the investigator manipulates; the particular treatment or condition the investigator is most interested in the effects of
Dependent Variable = What is measured or observed; the "data" collected in the experiment
Experimental Group = Those participants exposed to the independent variable
Control Group = 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.
Independent Variable: ___________________________ Dependent Variable: ____________________________________
Experimental Group: _____________________________ Control Group: ________________________________________
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.
Independent Variable: ____________________________ Dependent Variable: ____________________________________
Experimental Group: ______________________________ Control Group: ________________________________________
3) An industrial psychologist is interested in whether lowering the temperature in a packing room will increase productivity (number of products...