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Repeated Measures Recruit a group of participants Condition 1Condition 2 The group does the experimental task with the IV set for condition 1 The group repeats the experimental task with the IV set for condition 2 Compare the results for the two conditions
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Experimental design – how Ps Experimental design – how Ps are allocated to each condition are allocated to each condition
of the IVof the IV
RRepeated measuresepeated measuresIIndependent measuresndependent measuresMMatched participantsatched participants
Independent MeasuresIndependent MeasuresRecruit a group of
participantsDivide them
into two
This group does the experimental task with the
IV set for condition 1
This group does the experimental task with the
IV set for condition 2
Measure the DV for each group
Compare the results for the two groups
Repeated MeasuresRepeated MeasuresRecruit a group of
participants
Condition 1 Condition 2
The group does the experimental task with the
IV set for condition 1
The group repeats the experimental task with the
IV set for condition 2
Compare the results for the two conditions
Matched ParticipantsMatched ParticipantsRecruit a group of
participants
Find out what sorts of people you have in the
group
Recruit another group that
matches them one for one
Condition 1 Condition 2
Compare the results for the matched pairs
Treat the experiment as independent
measures
Independent MeasuresIndependent Measures
AdvantagesAdvantages
No order effectsNo order effects
Fewer demand Fewer demand characteristicscharacteristics
Same materials can be Same materials can be used with each used with each conditioncondition
DisadvantagesDisadvantages
Participant variables – Participant variables – extraneous variable?extraneous variable?
More participants More participants requiredrequired
Repeated MeasuresRepeated Measures
AdvantagesAdvantages
Participant variables Participant variables are controlledare controlled
Fewer participants Fewer participants requiredrequired
DisadvantagesDisadvantages
Order effects (practice, Order effects (practice, boredom)boredom)
Demand Demand characteristicscharacteristics
Different materials Different materials must be used in each must be used in each conditioncondition
Matched ParticipantsMatched Participants
AdvantagesAdvantages
Participant variables Participant variables are controlledare controlled
No order effectsNo order effects
Fewer demand Fewer demand characteristicscharacteristics
Same materials can be Same materials can be usedused
DisadvantagesDisadvantages
Perfect matching is Perfect matching is not possiblenot possible
Time consuming to Time consuming to match Psmatch Ps
More participants More participants neededneeded
Match the key term to the Match the key term to the definitiondefinition
Key termKey term• Participant VariablesParticipant Variables
• Order effectsOrder effects
• CounterbalancingCounterbalancing
DefinitionDefinitionAn EV that occurs in a repeated An EV that occurs in a repeated measured design – Ps either get measured design – Ps either get bored or get better through bored or get better through practice so performance changespractice so performance changes
An experimental technique used to An experimental technique used to overcome order effects – half Ps overcome order effects – half Ps are tested in one condition first are tested in one condition first and half the other first, e.g. ABBAand half the other first, e.g. ABBA
A type of EV in which any A type of EV in which any characteristic of individual characteristic of individual participants may affect results (in participants may affect results (in independent measures design)independent measures design)
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