experimental designs

Outline matches pairs experiment design

Participants are put in pears with the same characteristics and Each person from the pair does a different condition

Outline independent measures design

A group of participants for each condition in the experiment

Outline repeated measures experimental design

All the participants do all the conditions

Define random allocation

Controlling the extraneous variables in independent measures by randomly selecting participants for each condition

Define order effects

When participants become bored or tired after repeating experimental conditions

Define counterbalancing

Half of the participants do condition are the other half due condition be and switch to eliminate order effects

Outline two strengths of independent measures design

-no order effects

-reduced demand characteristics

Outline two weaknesses of independent measures design

-requires more participants

-individual differences

Outline Two strengths of repeated measures design

-less p’s required

-no individual differences

Outline two weaknesses of repeated measure design

-order effects

-increased demand characteristics

Outline two strengths of the matched pairs design

-no order effects

-less demand characteristics

Outline two weaknesses of the matched pairs design

-more p’s required

-individual differences

How to deal with RM issues?

Counterbalancing

How to deal with IG issues?

Random allocation

How to deal with MP issues?

Reduce time spent by having less participants and variables