Types of investigation

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Reaerch methods revision
Types of investigation
Type of investigation description strengths weaknesses
Laboratory experiment An experiment is when 2 High internal validity- Lacks ecological
groups are compared to see if all extraneous variables validity- findings can't
there is a difference. The IV are controlled so cause be generalised to real
is altered directly by the
and effect can be life
experimenter. All other
extraneous variables are determined
tightly controlled. DV's are
observed and recorded.
Field experiment Comparing 2 groups to see if High ecological validity- Low internal validity-
there is a difference which represents what happens harder to control
takes place in a real life in real life extraneous variables so
cause and effect
relationships can't be
Natural experiment The IV is not altered by the If the groups are tested Groups can be biased as
experimenter but by forces of in a natural environment they weren't randomly
nature. Extraneous variables then the results have selected so valid
are controlled but the extent
high ecological validity conclusions cannot be
to which is determined by the
environment the experiment is although if the setting is made.
in. artificial they will have
poor ecological validity
correlation 2 DV's investigated to see if Allows the investigation Can't establish cause
there is a link between them. of areas in which a and effect relationships

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Reaerch methods revision
experiment would be so we don't know if the
unethical link is the actual cause.
Self report measures Questionnaire- open, Interviews: participants Social desirability bias,
closed questions or can check to make sure which is when people lie
likert scale they understand a to fit in with societies
Interviews- structured question and a question expectations and this
or unstructured can be changed to suit lead to poor internal
questions the participant.…read more

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Reaerch methods revision
Naturalistic- good Naturalistic- hard to
ecological validity establish cause and
Controlled- high internal effect
validity Controlled- low
ecological validity…read more


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