types of investigation

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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 the
and effect relationships real life
experimenter. All other
extraneous variable are can be determined.
tightly controlled. The DV is
observed and recorded.
Field experiment Comparing two groups to see High ecological validity Low internal validity as
if there is a difference, which as it represents what it is harder to control
takes place in a real life happens in real life extraneous variables, so
setting harder to control
cause and effect
extraneous variables
relationships can't be
Natural experiment The IV is not altered by the If the groups are Groups can be biased as
experimenter but by another tested in a natural they aren't randomly
force of nature. Extraneous setting then the study allocated so valid
variables are controlled but
will have good conclusions can't be
the extent to which is
determined by the ecological validity made
environment the experiment is however if the groups
conducted in. are tested in artificial
settings them they will

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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 the link is
the actual cause.…read more

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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 ethical characteristics
be seen)
than covert Naturalistic: hard to
Naturalistic: good establish cause and
ecological validity effect
Controlled: high Controlled: bad
internal validity ecological validity…read more


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