Control of extraneous variables, demand characteristics and investigator effects

Extraneous variables

Psychologist example

An example extraneous variable and how to control it

Demand characteristics

reducing demand characteristics

Investigator effects

reducing investigator effects

extraneous variable - 4 types

1. participant variables

2. situational variables

3. demand characteristics

4. investigator effects

Example studies

Example studies

Example studies

how to control it