Extranuous And Confounding Variables

Question 1

Extraneous variables

Answer 1

Unwanted extra variables other than the IV

That could have an effect on the DV

This would lower internal validity of the study

Question 2

Situational variables

Answer 2

things to do with the environment

Eg task difficulty or standardised instructions

Question 3

Participant variables

Answer 3

Things to do with the participants

Eg ages, iq ,personality

Question 4

Experimenter variables

Answer 4

Things to do with the researcher eg
The investigator

Question 5

Confounding variables

Answer 5

When extraneous variable is not controlled and does affect the DV

Question 6

Identify an EV and explain how it can be controlled ?

Answer 6

Name (1mark)
State how you can control it (1 mark )

Question 7

Identify and EV and explain why it should be controlled ?

Answer 7

Name (1 mark)
Explain links to the scenario (1 mark )
State why it should be controlled , what impact would it have on the Dv , like lowering internal valdity (1 mark )

Question 8

Demand characteristics

Answer 8

Clues given off within the research , could lead to the ppts to change their natural behaviour

Choosing either to help or hinder the research

Question 9

How could demand characteristics be controlled ?

Answer 9

Getting another researcher who does not the the aims of the research , to carry out the experiment thus not giving clues to influence the ppts

Question 10

Control : randomisation

Answer 10

Aspects of research should be random and not decided by researcher

Eg if ppts have to learn list of words it should be randomly generated out of a hat

Question 11

Control : standardisation

Answer 11

All ppts experience same environment and instructions

Eg using same instructions and procedures for all ppts, includes standardised instructions that are read out to all ppts