Of 100 individual with moderate depression, 50 are given 8 weeks of new cognitive-behavioral therapy, while the other 50 are put on the waiting list. At the end of the 8 weeks, they are tested for their level of depression. Manipulated Variable: Responding Variable: Experimental Group: Controlled Group:

Of 100 individual with moderate depression, 50 are given 8 weeks of new cognitive-behavioral therapy, while the other 50 are put on the waiting list. At the end of the 8 weeks, they are tested for their level of depression. Manipulated Variable: therapy Responding Variable: level of depression Experimental Group: those given therapy Controlled Group: those not given therapy

Manipulated Variable: A biopsychologist study the effects of anabolic steroids on aggressive behavior of female rats. 24 are given injections a placebo (no drug) and the others are given a steroid. Round-the-clock video tapes of the communal cages of all rats allow all aggressive encounters to be counted and timed. Manipulated Variable: Responding Variable: Experimental Group: Controlled Group:

Manipulated Variable: Steroid Injection A biopsychologist study the effects of anabolic steroids on aggressive behavior of female rats. 24 are given injections a placebo (no drug) and the others are given a steroid. Round-the-clock video tapes of the communal cages of all rats allow all aggressive encounters to be counted and timed. Manipulated Variable: Steroid Injection Responding Variable: # of aggressive encounters Experimental Group: those given steroids Controlled Group: those given placebo (no steroids)

A industrial psychologist is lowering the temperature in a packing room to see if it will increase productivity. Workers in two equivalent packing rooms participate in the study. One room is maintained at 65 degrees and the other is at the usual company temp (76). Manipulated Variable: Responding Variable: Experimental Group: Controlled Group:

A industrial psychologist is lowering the temperature in a packing room to see if it will increase productivity. Workers in two equivalent packing rooms participate in the study. One room is maintained at 65 degrees and the other is at the usual company temp (76). Manipulated Variable: temperature of room Responding Variable: work productivity Experimental Group: 65 degrees Controlled Group: 76 degrees

Manipulated Variable: You want to test which size of soccer ball is easiest to juggle with your feet. You test a size 3, size 4 and size 5 ball of the same brand. You count the seconds the ball stays in the air for each of the trials. You allow yourself to use both of your feet, knees, and head to juggle the ball. Size 5 is the most common size for soccer leagues. Manipulated Variable: Responding Variable: Experimental Group: Controlled Group:

Manipulated Variable: Size of Ball Responding Variable: Time to Juggle You want to test which size of soccer ball is easiest to juggle with your feet. You test a size 3, size 4 and size 5 ball of the same brand. You count the seconds the ball stays in the air for each of the trials. You allow yourself to use both of your feet, knees, and head to juggle the ball. Size 4 is the most common size for soccer leagues. Manipulated Variable: Size of Ball Responding Variable: Time to Juggle Experimental Group: Size 3 and 4 balls Controlled Group: Size 5 ball