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experimental design - Coggle Diagram
experimental design
independent measures
strengths
reduced demand characteristics because less likely to guess aim because they only take part in one part of the experiment
can control individual differences through random allocation to conditions, meaning a probable distribution of participant variations because of equal chance to be chosen
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matched pairs
strengths
any different found between results of the conditions is more likely to be due to the IV so causation can be established
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participants are assigned to each donation and then matched on characteristics important to the study, established by research and pretesting
repeated measures
strengths
resolves the effects of individual differences because one participant is compared to themselves in the other condition
fewer participants are needed, so it is more cost effective than independent groups
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order effects can be controlled bu counterbalancing where participants are placed in a group that either does condition A first and then B and other groups do B and then A
weaknesses
greater chance of demand characteristics because participants are more likely to guess the aim after doing multiple conditions
chance of order effects (practice or fatigue) due to doing multiple conditions, influencing performance of participant
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