2553141
Description
Flashcards by Charlotte Hewson, updated more than 1 year ago
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Created by Charlotte Hewson
about 9 years ago
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| Question | Answer |
| describe a repeated measures design | all participants do every condition |
| describe an independent groups design | participant allocated to a group. each group takes part in one condition |
| describe matched pairs design | pairs of participants are matched on key variables (e.g. age, gender, intelligence) one member of each pair is under one condition, the other members do the other condition |
| what are 2 limitations of repeated measures? | -order effects -more likely to guess the aim |
| how would an order effect change results? | they may do better through practice, or worse through boredom/tiredness |
| what may participants guessing the aim lead to? | altered behaviour, this then affects the validity of the results |
| what are 2 limitations of independent groups? | -lack of control over participant variables -more participants are needed than in repeated measures |
| what do participant variables act as? | extraneous variables |
| how can this be prevented? | random allocation |
| how many more participants are needed for independent measures design? | twice as many |
| what ae two limitations of matched pairs? | -time consuming -cant control all participant variables |
| why is it so time consuming? | must start with very large group and sort through to find sufficiently matched participants |
| why cant you control all participant variables? | the potential list is too long |
| what do these uncontrolled variables act as? | extraneous variables |
| what is counterbalancing? | each condition is tested first or second in equal amounts |
| what are the two ways to do this? | some participants do condition A then condition B other participants do condition B then condition B |
| what is the other way to do this? | ABBA design. all participants are tested 4 times |
| what happens in a single blind trial? | participants re 'blind' to the aims of the study. they may be given a cover story to stop them guessing the aim. |
| what happens in a double blind trial? | both the participants and researcher are 'blind' to the aims of the study. |
| what does a double blind trial reduce? | experimenter effects |
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