Variables (EV's and confounding)

Question 1

What are extraneous variables?

Answer 1

Factors which can influence the DV other than the IV.

Question 2

What are the 4 types of EV’s?

Answer 2

1. Participant - e.g. IQ.
2. Situational - e.g. lighting/noise
3. Investigator effects - e.g. raised eyebrows after Ps answer
4. Demand characteristics