Spec 1PS0
Revise Edexcel GCSE Psychology 11.1.2 Controlling extraneous variables with the question bank, lessons, revision guides, and flashcards.
Understand the influence of extraneous variables and suggest possible ways to control for them, including: • a. use of standardised procedures • b. counterbalancing • c. randomisation • d. single-blind techniques • e. double-blind techniques