Research methods Flashcards
What are 3 characteristics of scientific research?
Objective, independent of beliefs or opinions
What did Popper (1969) argue about scienfic theories?
That they should be falsifiable, in every experiment there should be an attempt to falsify it
How can psychological research affect the economy?
People with untreated mental health disorders may need more time off work research into treatment can help reduce this, and research into sleep behaviours can help shift workers
What is a Laboratory experiment?
Aim is to control all relevant variables except one key variable which is altered to see what the effect is (IV) always conducted in an artificial setting
What are the advantages of lab experiments?
Effects of cofounding variables are minimised easy to replicate and its possible to establish a cause and effect relationship, low ecological validity
What are the disadvantages of lab experiments?
Its artificial so doesn’t measure real-life behaviour, there’s the chance of demand characteristics and there often an element of deception used making informed consent hard
What is a field experiment?
Conducted outside of the lab, behaviour is measured in a natural environment and a key variable is altered to its effect can be measured
What are the advantages of field experiments?
Can establish a cause and effect relationship, there’s high ecological validity and demand characteristics can be avoided
What are the disadvantages of field experiments?
There’s no control over extraneous variables and element of deception used, participants normally don’t give consent to be observed sometimes causing distress
What is a natural experiment?
When the researcher looks at an IV which isn’t manipulated by the researcher and now it effects DV, IV isn’t manipulated because its and event which occurs naturally
What are the advantages of natural experiments?
It is possible to study variables what would otherwise be unethical as its naturally occurring, demand characteristics can be avoided and high ecological validity
What are the disadvantages of natural experiments?
Can’t identify cause and effect relationship as your not the one manipulating the IV, other variables may effect it and deception is often used making informed consent difficult
What is a Quasi experiment?
Researcher isn’t able to use random allocation to put participants into groups, as the IV is a particular feature of participants such as gender
What are the advantages of quasi experiments?
Carried out under controlled conditions, resulting in high ecological validity
What are the disadvantages of quasi experiments?
Can’t randomly allocate participants to a conditions meaning there’s no control over those variables making it hard to establish cause and effect relationships
What is a peer review
Process used to ensure the integrity of published scientific work
Before publication the work is sent to experts in the field to assess the quality of the work
What’s good about peer reviews
They help keep the scientists honest, if they set up their experiments it won’t pass peer review
Helps to validate conclusions
What’s bad about peer review
Sometimes mistakes are made and bad science is published
Peers may not publish work as its close to their own work/proves their work wrong
What have our currently accepted theories survived to be published
‘Trial by evidence’ meaning results are there to back them up
What is a paradigm
A set of principles, methods or techniques which define a scientific discipline
What did Kuhn (1970) say something must have to be a science
A paradigm
What is the paradigm shift
Some believe that psychology has a paradigm, it was initially behaviourism but then it underwent a change to cognitive psychology, this change is a paradigm shift
What is a naturalistic observation
Involved observing subjects in their natural environment
Researchers take great care not to interfere in any way with the subjects their studying
What are the strengths of a naturalistic observation
High ecogical validity, the RPS behaviour is natural and no demand characteristics
Useful in theory development
What are the weaknesses of a naturalistic observation
You can’t control extraneous variables
Observer bias, affecting what’s recorded or focused on
Participants haven’t given consent to be studied
What is correlational research
Looks for a relationship between 2 variables
All variables aren’t manipulated as in an experiment, it’s not possible to state that just these two variables rise and fall together there might be a third unknown variable
What are the strengths of correlational research
Causal relationships, these can be rules out if no correlation exists
You can study variables that would be unethical to manipulate
What are the weaknesses of correlational research
Casual relationships can’t be assumed from a correlation which may be caused by a third unknown variable
Ethics, misrepresentation can be an issue sometimes the media infer causality from a correlation
What are the strengths of a questionnaire
Practical as you can collect large amounts of data easily, quickly and cheaply
What are the weaknesses of a questionnaire
Some bad questions may be added, leading questions which suggest an answer
Biased sample, certain types of people are more likely to respond
Self report meaning people are more likely to show themselves in a good light
Ethics, confidentiality can be an issue
What is a structures interview
Follow a fixed set of questions that are the same for all participants
What is an unstructured interview
May have discussion topics but are less constrained about how the conversation goes
What are the strengths of an interview
Rich data can be gathered (detailed)
Useful way to gather info before a study (pilot study)
What are the weaknesses of a interview
Self report techniques, people might want to she themselves in a good light
It’s impractical as it’s time consuming and requires skilled interviewer
Analysis of the data can be hard
Confidentially can be a problem
What do case studies allow the researcher to do
Analyse unusual cases in a lot of detail
What are the strengths of a case study
Rich data can be collected as they have the opportunity to study rare cases
And unique cases can challenge existing ideas and theories
What is a negative of case studies
They can’t establish a cause and effect relationship
Only studying a single case makes generalising the results extremely difficult
Informed consent can be difficult to obtain in some cases
What is content analysis
A research method used to analyze secondary data and data you’ve already collect
It involves splitting the data into assigned categories
What are strengths of content analysis
It’s usually cheap and easy to do
Interpretation and categorizing the data can be subjective
What is an aim
A statement of a study purpose, research should state its aim beforehand so that it’s clear what the study intends to investigate
What is a hypothesis
What’s actually being studied
What are the 4 types of hypothesis
Null
Alternative
Directional
Non-directional
What is a null hypothesis
Is what your going to assume is true during the study
Any data you collect will either back up the assumption or it won’t
If the data doesn’t support you reject the null and go with alternative instead
Usually predicts there’s no significant difference
What is an alternative hypothesis
If data forces you to reject the null the you accept the hypothesis instead
What’s a directional hypothesis
A hypothesis might predict a difference between the exam results obtained by two groups of students
If the hypothesis states which group would do better than it’s making a directional prediction
What’s a non-directional hypothesis
A hypothesis that will state a difference but not a direction it would go in
Used when there’s no previous research
What is a variable
Is a quantity whose value can change
What is the independent variable
Is variable that’s directly manipulated by the researcher
What is the depended variable
Variable that you think will be affected by changes in the IV
What is meant by operationalisation
Variables must operationalised, this means describing the process by which the variable is measured
What does operationalisation allow
Allows others to see exactly how you’re going to define and measure your variables
What are the 3 experimental designs
Independed groups design
Repeated measure design
Match pairs design
What is an independent group design
Means there are different participants in each group
Avoids problem that if all participants did the test in both conditions any improvement in performance might be due to them having two goes at the task
What is an advantage of independent groups design
No order effects, no one gets better through practice (learning effects)
Mo one gets worse through being bored or tired (fatigue effect)
What is a disadvantage of independent groups design
Participant variables: differences between the people in each group might affect the result
Number of participants: twice as many participants are needed to get the same amount of data compared to having everyone do both conditions
What is meant by repeated measure design
Where all participants do the same task both with an audience and then without
You can compare the performance in each condition knowing the differences weren’t due to participant variables
What is an advantage of repeated measure design
Participant variables now the same people do the test in both conditions so any differences between individuals should affect results
Number of participants: fewer participants are needed to get the same amount of data
What is a disadvantage of repeated measure design
Order effects
What is a matched paired design
Means there are different participants in each condition but they’re matched on important variables
Participants are paired on a relevant characteristic such as age and then two members of the pair are randomly assigned to either conditions
What is an advantage of matched pairs design
No order effects different people in each condition
Participant variables: important variables are minimised though matching
What is a disadvantage of matched pairs design
Need twice as many participants
Time consuming
why should variables be controlled?
Avoid the effects of extraneous variables
what is counterbalancing
mixing up the order of the tasks
half the rps do the tasks in one order and the other do it in the opposite
what does counterbalancing help to eliminate
order effects in repeated measure design