extraneous variables

Question 1

the experimenter demonstrated cause and effect if-

Answer 1

the only thing that has affected the DV is the IV, and that the change in the DV is due to the IV

Question 2

determining cause and effect is threatened by extraneous variables
define extraneous variables

Answer 2

any variable apart from the IV that could have an effect on the DV, unwanted extra variables that we need to control that may interfere with relationship between the IV and the DV, IF EVS are not controlled this means the researcher cannot know what truly caused the change in the DV.

Question 3

name the 3 ways psychologists can control EVS

Answer 3

standardised instructions, standardised procedures, randomisation

Question 4

define standardised instructions

Answer 4

all participants should receive exactly the same information throughout an investigation

Question 5

define standardised procedures

Answer 5

using exactly the same methods and instructions for all participants in a research study

Question 6

define randomisation

Answer 6

using chance in an experiment to control for the effects of bias when designing a research study

Question 7

define bias

Answer 7

a leaning in one direction rather than another