Example: We want to perform an experiment that is designed to determine which pain reliever aspirin, acetaminophen, or ibuprofen and at which dosage low or high is more effective at relieving pain after tooth extraction.
Experimental units : subjects that have had a tooth extracted
Factors: type of pain reliever, dosage
Levels: type of pain reliever: aspirin, acetaminophen, ibuprofen
dosage: low or high
Treatments:
|
Type of Pain Reliever |
||||
|
Aspirin |
Acetamin. |
Ibuprofen |
||
|
Dosage |
Low |
Aspirin, 325 mg |
Acetamin. 325 mg |
Ibuprofen 200 mg |
|
High |
Aspirin, 650 mg |
Acetamin. 650 mg |
Ibuprofen 400 mg |