1. 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:

2. 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

3. 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:

4. 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)

5. 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:

6. 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

7. 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:

8. 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