Experimenatl design
Teacher recommended
?- Created by: rebeccamellors
- Created on: 12-12-16 12:01
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- Experimental Design
- Experimental design refers to the different ways in which the testing of ppts can be organised in relation to the experimental conditions
- Independent Groups
- Is when two separate groups of ppts experience two different conditions of the experiment
- There are two levels of the IV meaning that all ppts will experience one level of the IV
- Performance of the two groups would be compared
- Evaluation
- Biggest issue = ppts who occupy the different groups aren't the same so differences may be due to the individual and not effect of IV
- This design is less economical than repeated measure as each ppt only contributes a single result
- Strength - order effects aren't a problem and ppts are less likely to guess the aim
- Repeated Measures
- All ppts take part in all conditions of the experiment
- The two sets of data from both conditions would be compared to see if there was a difference
- Evaluation
- Biggest issue = each ppt has to do two tasks and order of these may be significant
- Order effects may arise as repeating two tasks may cause fatigue or boredom that may cause performance to deteriorate
- More likely that ppts will work out the aim of the study so demand characteristics may occur
- Strengths - ppt variables are controlled and fewer ppts are needed
- Matched Pairs
- Ppts are paired/matched based on variables that may affect the DV
- One member of the pair does condition A and the other does condition B
- Evaluation
- Ppts only take part in one condition so order effects and demand characteristics are less of a problem
- Ppts can never be matched exactly, even when identical twins are matched there will still be important differences between them that may affect DV
- Matching may be time consuming and expensive so this is less economical than other designs
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