2868072
Description
Mind Map by Sujin Jung, updated more than 1 year ago
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Created by Sujin Jung
almost 9 years ago
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Psychology research method
- Variables
- Extraneous
- All variables, which are not the
independent variable, but could affect
the results (e.g. dependent variable) of
the experiment.
- All variables, which are not the
independent variable, but could affect
the results (e.g. dependent variable) of
the experiment.
- Dependent
- The variable which you measure
- The variable which you measure
- Independent
- The variable which you change
- The variable which you change
- Extraneous
- Design used in experiments
- Independent measures
- Description
- Different participants are used in each condition of the
independent variable. This means that each condition
of the experiment includes a different group of
participants. This should be done by random allocation,
which ensures that each participant has an equal
chance of being assigned to one group or the other.
- Different participants are used in each condition of the
independent variable. This means that each condition
of the experiment includes a different group of
participants. This should be done by random allocation,
which ensures that each participant has an equal
chance of being assigned to one group or the other.
- Evaluation
- Strength : Avoids order effects (such as
practice or fatigue) as people participate
in one condition only. If a person is
involved in several conditions they may
become bored, tired and fed up by the
time they come to the second condition,
or becoming wise to the requirements of
the experiment!
- Limitation : More people are needed than
with the repeated measures design (i.e. more
time consuming).
- Strength : Avoids order effects (such as
practice or fatigue) as people participate
in one condition only. If a person is
involved in several conditions they may
become bored, tired and fed up by the
time they come to the second condition,
or becoming wise to the requirements of
the experiment!
- Description
- Repeated measures
- Description
- The same participants take
part in each condition of the
independent variable. This
means that each condition of
the experiment includes the
same group of participants.
- The same participants take
part in each condition of the
independent variable. This
means that each condition of
the experiment includes the
same group of participants.
- Evaluation
- Strength : Fewer people are needed
as they take part in all conditions (i.e.
saves time)
- Limitation : There may be order effects. Order
effects refer to the order of the conditions having
an effect on the participants’ behavior.
Performance in the second condition may be
better because the participants know what to do
(i.e. practice effect). Or their performance might be
worse in the second condition because they are
tired (i.e. fatigue effect).
- Strength : Fewer people are needed
as they take part in all conditions (i.e.
saves time)
- Description
- Matched pairs
- Description
- One pair must be randomly assigned to the
experimental group and the other to the
control group.
- One pair must be randomly assigned to the
experimental group and the other to the
control group.
- Evaluation
- Strengths : Avoids order effects, and so counterbalancing is not necessary.
- Limitation : Impossible to match people exactly, unless identical twins!
- Strengths : Avoids order effects, and so counterbalancing is not necessary.
- Description
- Independent measures
- Laboratory experiment
- Description
- The researcher decides
where the experiment will
take place, at what time,
with which participants, in
what circumstances and
using a standardised
procedure. Participants are
randomly allocated to each
independent variable
group.
- The researcher decides
where the experiment will
take place, at what time,
with which participants, in
what circumstances and
using a standardised
procedure. Participants are
randomly allocated to each
independent variable
group.
- Evaluation
- Strength : It is easier to replicate
(i.e. copy) a laboratory experiment.
This is because a standardised
procedure is used.
- Limitation : The artificiality of the setting
may produce unnatural behavior that does
not reflect real life, i.e. low ecological
validity. This means it would not be possible
to generalize the findings to a real life
setting.
- Strength : It is easier to replicate
(i.e. copy) a laboratory experiment.
This is because a standardised
procedure is used.
- Description
- Field experiment
- Description
- Field experiments are done in the everyday (i.e.
real life) environment of the participants. The
experimenter still manipulates the independent
variable, but in a real-life setting (so cannot
really control extraneous variables).
- Field experiments are done in the everyday (i.e.
real life) environment of the participants. The
experimenter still manipulates the independent
variable, but in a real-life setting (so cannot
really control extraneous variables).
- Evaluation
- Strength : Behavior in a field experiment
is more likely to reflect life real because of
its natural setting, i.e. higher ecological
validity than a lab experiment.
- Limitation : There is less control
over extraneous variables that
might bias the results. This makes
it difficult for another researcher
to replicate the study in exactly
the same way.
- Strength : Behavior in a field experiment
is more likely to reflect life real because of
its natural setting, i.e. higher ecological
validity than a lab experiment.
- Description
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