what are experiental methods
- field
- quasi
- lab
what is a lab experiment
- highly controlled environment whihc is artificial and set up for purpose of study
- iv is manipulated by reseracher
what are 2 strengths and 2 weaknesses of a lab study
+ high levels of control over possible EVs so cause and effect established
+ highly standardised so can replicate the study so ability for reliablity
- low ecological validity so hard to generalise to real life
- high risk of demand characteristics due to unnatural setting, lacks internal validity
what are 2 strengths and 2 weaknesses of field experiments
+ high in ecolocical validity so can generalise behaviour to real life
+ pp usually unaware taking part in study so behaviour is more narural so no demand characteristics so increased validity
- poor control of EVs so lack validity and harder to establish cause nd effecte
- lesss standardisation so less able to replicate lowering relaibiity
what are 2 strangths ad 2 weaknesses of a quasi experient
+ can study behaviour that would be unethical so more insight in behaviour we couldnt study otherwise
+ still have high levels of control over EVs so can establish cause and effect
- cant randoly allocate pp to conditions which may increase rsik of indivual differences so lack validity
- often conducted in labs so if task is unnatural then study lacks ecolocical validity so cant generlaise to real life
what is a field experiment
natural everydau environment
manipulation of iv
what is a quasi experiment
can be in controlled or natural environment
naturally occuriing iv so no manipulation
what is an independant measures design
different pp take part in different conditions
pp are randomly allocated to one of the conditions
what are 2 strengths and 1 weakness of a independant measures design
+ no risk of order effects so increased internal validty
+ reduces risk of deman charcteristics so increased internal validty
- risk of individual differences affecting results so lack internal validity
what is a repeated measures design
all pp take part in all conditions of the study
what is a strength and 2 weaknesses of repeasted measures design
+ no risk of indiviual differences affecting results so increase internal validity
- high risk of order effects so lack of internal validty
- high risk of demand chara teristics so low internal validity
what is a matched pairs design
2 differenct groups of pp but researcher allocates pp to each group to enusre groups match in terms of key charcateristics that could affect results
what is a strength and a weakness of matched pp
+ no risk of order effects so increased internal validty
- very difficult to put in place especially with larger samples so less economical
