research methods Flashcards
features of experiments
- Experimenters compare data collected from 2+ experimental groups
with data collected in a control group to make conclusions
about causality - Control groups provide baseline
- IVs are manipulated and DVs are
measured. - The DV is measured with the belief that any difference
is caused by the IV - Standardised procedures and instructions are often used to give
participants the same experience.
what is a lab experiment
Maintained where the experimenter has a high level of
control
strengths of lab experiment
- Ethics – participants give
consent, but its not always informed. The
right to withdraw is often given - Reliability – procedures ave
standardised instructions and procedures,
giving consistency - Validity – a high level of control allows
causality to be shown
weakness of lab experiment
- Ethics – there may be deception of the
aim of the study to ensure validity - Validity – artificial conditions can produce unnatural behaviour,
lowering ecological validity - Validity – features of the environment
may reveal the aim, leading to demand characteristics
what is a field experiment
an experiment that takes place in natural settings
strengths of a field experiment
- Validity – participants do not know they are taking part,
so they are less likely to show demand characteristics. - Validity – there is high ecological validity as
participants are in their everyday environment.
weakness of field experiment
- Ethics – participants often don’t know they are taking
part so this removes their right to withdraw and
debriefing is often impossible. - Reliability – there is less control over extraneous
variables, so research is difficult to replicate
what is independent measures design
Each participant takes part in one group/condition of the independent variable
what are experimental designs
how participants are allocated to groups/conditions
of the independent variable.
3 types of experimental design
- repeated measures,
- independent measures
- matched pairs
strengths of independent measures desin
- Validity: no ordegn effects as participants take
part in only one condition e.g. fatigue, boredom, or
practice effects. - Validity: Less chances of demand characteristics
weaknesses of independent measures design
- Validity: More participants are needed to get data.
- Validity: No control for participant variables.
eg. participants in one group may be naturally
better at the task given.
how can you eliminate participant variables in independent measures
Random allocation: done by tossing a coin or allowing a computer to
allocate groups.
what is repeated measures design
Each participant takes part in all conditions of the IV
strengths of repeated measures
- Validity: Participant variables are
controlled as the same people do both
conditions. - Fewer participants are needed, which is
useful if samples are limited
weaknesses of repeated measures
- Validity: Order effects can occur, so demand characteristics increase
- Apparatus may need duplicating
how can you eliminate order effects in repeated measures
counterbalance conditions. Half the participants first experience condition A
and then condition B, while the other half do B then A.
what is matched pairs design
Participants are matched for variables that could affect the results. Then, each
participant takes part in only one condition of the IV.
strengths of matched pairs design
- Validity: Participant variables are
controlled. - Validity: No problems with
order effects.
weaknesses of matched pairs design
- Validity: Not all
relevant variables may be able to be matched. - It can be difficult and time-consuming to find participants.
what are a self reports
Allow participants to respond to questions about their beliefs and
opinions, and discuss their behaviours.
2 types of self reports
- questionnaire
- interview
features of questionnaires
- Questionnaires can be done by hand or online.
- How questions are asked depends on the type of response/data the researcher wants.
3.Data can be quantitative or qualitative .
strengths of questionnaires
- Questionnaires can obtain views from
a large sample - Anonymity can lead to more honest
answers.