| A | B |
|---|
| control group | group that does not receive the factor being tested (recieves the placebo) |
| treatment group | group receiving the factor being tested (does not receive the placebo) |
| randomization | how individuals assigned to the treatment groups |
| replication | repeating an experiment on many patients |
| lurking variable | possible underlying cause of change in response in the experimental group |
| bias | when one is not measuring what one hoped to measure |
| double-blind experiment | individuals and observers do not know which subjects receive treatment |
| observational study | data is obtained by not changing the response or the variable being measured |
| experiment | treatment imposed on individuals to find change in variable measured |
| census | observations from the entire population used |
| sample | observations from a representative part of population used |
| placebo | dummy drug used to determine psychological effect |
