lesson 8 control of extraneous variables research methods

Question 1

difference between extraneous and confounding variables

Answer 1

extraneous variables might ruin the experiment
confounding have ruined the experiment

Question 2

what are participant variables?

Answer 2

characteristics of the participant that might affect the DV

Question 3

how do we solve participant variables?

Answer 3

use matched pairs and repeated measures
random allocation of participants to conditions when using independent groups can ensure groups are not biased

Question 4

what are environmental variables?

Answer 4

factors in the environment where the experiment is conducted that could affect the DV

Question 5

how do we solve environmental variables?

Answer 5

standardisation

Question 6

what are investigator effects?

Answer 6

when the person collecting the data has knowledge of what the research aim is and that knowledge affects the data obtained

Question 7

how do we solve investigator effects?

Answer 7

double-blind technique
neither the participant nor the investigator knows the hypothesis of the study
certain physical characteristics can affect the behaviour of participants
standardised scripts should be used to ensure investigator acts in a similar way with all participants

Question 8

what are demand characteristics?

Answer 8

when participants act unnaturally in an attempt to please the researcher or annoy the researcher- ‘screw-you effect’

Question 9

how do we solve demand characteristics?

Answer 9

single- blind technique