Control of Variables

Question 1

Extraneous Variable

Answer 1

Any other variable which may have an effect on the DV if not controlled. Do not vary systematically with IV

Question 2

Confounding Variables

Answer 2

Any other variable that may have affected the DV so unsure of true source of changes to DV. Vary systematically with IV

Question 3

Demand Characteristics

Answer 3

Any cue from researcher/situation that may be interpreted by the P as revealing the purpose of the investigation. P may change behaviour in the situation

Question 4

Investigator Effects

Answer 4

Any effect of the investigators behaviour on the research outcome. Can include everything from the design of the study, selection, interaction with P

Question 5

Randomisation

Answer 5

Use of chance in order to control for the effects of bias when designing materials and deciding the order of conditions

Question 6

Standardisation

Answer 6

Using exactly the same formalised procedures and instruction for all P in study.