control of variables

Question 1

define extraneous variable

Answer 1

any other variable that is not the IV that affects the DV

Question 2

define confounding variable

Answer 2

a type of extraneous variable other than the IV that has an effect on the DV
- changes systematically with the IV

Question 3

define demand characterisrtics

Answer 3

any cue the researcher or the situation may give that makes the ppts feel they can guess the aim
changes in the ppts behaviour to comply with the hypothesis

Question 4

define investigator effects

Answer 4

unconscious chnages in the investigators behaviour to comply with the hypothesis

Question 5

give 2 ways to minimise the effects of extraneous or confounding variables

Answer 5

randomisation
standardisation