1. Experimental Design
Statistics

2. Confounding Variable
An experimenter cannot tell the difference between the effects of different factors on a variable.

3. Placebo Effect
A subject reacts favorably to a placebo

4. Blinding
The subject does not know whether he or she is receiving a treatment or a placebo.

5. Double-Blind Experiment
Neither the experimenter or the subject knows who has the treatment or the placebo

6. Randomization
A process of randomly assignment subjects to different treatment groups.

7. Randomized Block Design
First a group is divided into groups then randomly assigned to treatment groups
Control
30-39 years old
Treatment
Control
All subjects
40-49 years old
Treatment
50-59 years old
Control
Treatment

8. Replication
The repetition of an experiment using a large group of subjects