Experimental design

• expiremental design refers to the way in which participants are arranged in relation to the different expiremental conditions.
•  repeated measures design refers to the way in which participants are arranged in relation to the different expiremental conditions.
• Weaknesses of matched pairs design

  -time consuming to find pairs and expensive

  -more participants required
• Strengths of matched pairs design

  reduces participant variable because the researcher has tried to pair participants

  avoids order effects

  lower demand characteristics
• Weaknesses of repeated measures design

  order effects may occur

  more demand characteristics
• Strengths of repeated measures design

  -Differences are due to the IV not participant variables.

  -fewer participants needed.
• Weaknesses of independent groups design

  Less economical-time consuming 

  participant variables may make the comparisons unreliable eg one group could do better because thry are more intelligent.
• Strengths of Independent groups design

  -no order effects

  -limited demand characteristics
• What is matched pairs design?

  participants are matched on variables relevant to the expirement. eg IQ,gender