Variables controls

Question 1

Participant variables

Answer 1

• Have a large enough sample to gain representative samples
• Design e.g matched pairs minimize participant variables
• Randomisation / random allocation

Question 2

Situational variables

Answer 2

• Conduct a pilot study

- Standardisation

Question 3

Experimenter variables

Answer 3

• Double-blind - neither researcher nor participants know the conditions
• Inter-observer reliability - get an independent observer to rate the same behaviour and check for disagreement