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Page 1

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Research methods

Types of investigation

Investigation type description strengths Weaknesses

Laboratory experiment An experiment is when two High internal validity- Lacks ecological
groups are compared to see if all extraneous variables validity- can't
there is a difference. The IV are controlled so cause generalise results to
is altered directly by…

Page 2

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Research methods

have poor ecological
Correlation Two DV's are investigated to Allows the investigation Can't establish cause
see if they are linked (or have of areas in which an and effect so whilst we
a correlation) experiment would be know there is a link we
unethical don't know if…

Page 3

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Research methods

Large amount of detail have found different
Allows the investigation results due to individual
of areas in which an differences
experiment would be
observations Controlled, naturalistic, Covert: good ecological Covert: unethical
covert (observer can't be validity Overt: lots of demand
seen) and overt (observer can Overt: more…


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