variables (2)

What are EVs?

Variables that may influence the DV if not controlled

Why do EVs need to be controlled?

To help draw conclusions about the cause and effect of IV and DV

What are the 4 variables?

• Participant variables

• Situation variables

• Demand characteristics

• Investigator effects

Examples of PP variables (individual differences)?

• Age

• Gender

• Motivation

Examples of situation variables?

• Noise

• Temperature of room/time of day

• Order effects

Examples of demand characteristics ?

• screw you effect

• Please you effect

Examples Of investigator effects?

• Direct effect: investigator interacting with PPs

• Indirect effects: because of way investigator designed the study

Ways to deal with PP variables?

Design → repeated measures

→ matched pairs

Ways to deal with situation variables?

Standardisation → procedures

→ instructions

Ways to deal with demand characteristics?

• single blind design

• Experimental realism

Ways to deal with investigator effects?

• Double blind design

• Randomisation/ random allocation