control of variables

Question 1

Define extraneous variables

Answer 1

• any variable apart from the IV that may effect the DV if it is not controlled

Question 2

What are demand characteristics

Answer 2

• when ppts guess the intention of the study and so change their behaviour

Question 3

What are investigator effects

Answer 3

• any effect of the investigators behaviour on the research outcome

Question 4

Define the term randomisation

Answer 4

• the use of chance to decrease the likelihood of bias when designing the study

Question 5

What is standardisation

Answer 5

• using the same procedures for all ppts in the study