Research methods Flashcards
What is an aim?
A straightforward expression, identifying the purpose of an investigation. Normally contains the words ‘investigate’ or ‘investigation’
What is a hypothesis?
A hypothesis is a precise, testable statement of what the researcher predicts will be the outcome of the study. Will always contain information about two variables. Usually proposes a possible relationship or cause and effect between two variables
What is an experimental/alternative hypothesis?
A hypothesis used in the context of an experiment. Predicts a difference/relationship between two variables
What is a directional (one-tailed) hypothesis?
States the expected direction of the results (use the words: more, less, increased, decreased, improved)
What is a non-directional (two-tailed) hypothesis?
States an expected difference, but does not state the direction of the results (use the words: difference, affect)
Starts with ‘there will be a difference’
What is a null hypothesis?
Predicts no difference between the two variables. It states that there will be no relationship/difference between the variables being investigated.
Always starts with ‘there will be no difference’
What is meant by ‘operationalising variables’?
Explaining how variables will be measured (DV) or manipulated (IV)
What is meant by ‘extraneous variables’?
An extraneous variable is one which MIGHT interfere with the DV (also referred to as uncontrolled variables or nuisance variables)
Why is it important to standardise in research?
- We need to make sure the procedure used and what participants are required to do is consistent
- If we do not ensure this we cannot be sure that the IV is truly manipulating changes in the DV
What is meant by the term ‘mundane realism’?
Refers to how a study mirrors the real world
If a study lacks mundane realism what are researchers unable to confidently do?
Generalise the data beyond the particular unique research setting
What is meant by the term ‘validity’?
Validity refers to whether an observed effect is a genuine one. A study is valid if it measures what it claims to measure
What is internal validity?
Concerned with what is going on inside of a study
What is external validity?
The degree to which a research finding can be generalised to other settings, groups of people and over time
What is the experimental design?
The way in which participants are allocated during an experiment
What are the two types of conditions in a basic experiment?
- The experimental condition
- The control condition
State the three types of experimental design
- Repeated measures
- Independent measures
- Matched pairs
Describe repeated measures
- The group does the experimental task with the IV set for condition 1
- The group repeats the experimental task with the IV set for condition 2
The same participants take part in both conditions
What are the problems with repeated measures?
- Individual characteristics of participants might influence the way they perform in an experiment
- Practice effect may occur, when the participants have done one condition they might perform better in the second one because they know the task
- Order effects such as fatigue and boredom affect the results
- Increased chance of demand characteristics
What are the strengths of repeated measures?
- Fewer participants are needed
- Good attempt to control participant variables
Describe independent measures
-Participants are randomly allocated to one or other of the conditions
- One group takes part in one condition
- One group takes part in the other condition
What are the strengths of independent measures?
- Reduced chance of demand characteristics
- Can use the same stimulus materials
- Order effects do not occur as the participants do only one condition
What are the problems with independent measures?
- More participants are needed
- Individual characteristics of participants which might influence the way they perform in an experiment
- Least effective design for controlling participant variables
Describe matched pairs
-Participants are matched as closely as possible with another participant- the pairs are randomly allocated to either one or the other condition
What are the strengths of matched pairs ?
- Participants are matched as closely as possible with another participant
- Identical twins provide researchers with a close match
- Order effects do not occur as the participants do only one condition
- Participant variables are eliminated
What are the problems with matched pairs?
- It is not possible to match all the participants characteristics
- More participants are needed
- Matching participants is very time consuming
- Individual characteristics of participants which might influence the way they perform in an experiment
What is counterbalancing?
A technique used to reduce order effects in a repeated measures design
What does counterbalancing ensure?
Each condition is tested equally as first of second
What are the two ways of counterbalancing?
- AB or BA
- ABBA
Describe the AB or BA way of counterbalancing
- Divide participants into two groups
- In group 1 each participant does A then B
- In group 2 every participant does B then A
How are results compared in the AB or BA way?
You have all the data for participants and can compare their performance on the two conditions
Describe the ABBA way of counterbalancing
- A ll participants take part in each condition twice
- Trial 1: Condition A
- Trial 2: Condition B
- Trial 3: Condition B
- Trial 4: Condition A
How are results compared in the ABBA way?
Scores on Trial 1 and 4 are compared with scores on Trial 2 and 3
What is meant by validity?
Validity refers to whether an observed effect is a genuine one. A study is valid if it measures what it claims to measure
What is internal and external validity?
Internal validity- concerned with what is going on inside of a study
External validity- The degree to which a research finding can be generalised to other settings, groups of people and over time
What are the three types of external validity?
- Population
- Historical
- Ecological
What is a pilot study?
A pilot study is a small-scale practice investigation, where researchers can check all aspects of research. Changes to design, method and analysis can be made in the light of this.
The findings from a pilot study are….?
Irrelevant
What are the some of the problems in a study that a pilot study can show?
- The study doesn’t relate to real life
- Demand characteristics
- Whether the sample can be generalised
- Standardised procedures
- Experimental design
- Ethical issues
What are the three key features of experimental design?
- MANIPULATION OF THE IV- the IV is directly manipulated by the researcher to produce a change in the DV
- CONTROL- efforts are made to control or hold constant all variables other than the IV and DV
- RANDOMISATION- participants are randomly allocated to each of the conditions
What is a quasi-experiment? Give an example
In a quasi-experiment, the IV does not vary-it is a condition that already exists (e.g. age, gender). There is no direct manipulation of the IV and lack of random allocation.
Example: Sheridan and King
What are the strengths of quasi-experiments?
- Can be used when it is not possible to manipulate the IV
- They are easy to repeat and check the results (high in reliability)
- They can be used to determine cause and effect relationships due to the manipulation of the IV
What are the weaknesses of quasi-experiments?
- Participants know they are in a study so may guess the aim of the study and change their behaviour to fit accordingly (demand characteristics)
- The experiment is highly controlled so the situations may be seen as unrealistic and artificial
- The experimenter’s expectations can affect the results and participants may be influenced by these expectations
- Not possible to randomly allocate participants to conditions and therefore there may be confounding variables
What are natural experiments? Give an example.
In a natural study, the researcher takes advantage of a naturally occurring variable. This usually takes place when it is not practical or unethical to manipulate the IV
Example: Rutter and Songua-Barke
What are the strengths of natural experiments?
- Due to the real world setting, results are more likely to relate to real life (mundane realism)
- The participants usually don’t know they’re in a study so their behaviour is more natural
- Can be used when it is not possible to manipulate the IV
What are the weaknesses of natural experiments?
- It is more difficult to control extraneous variables
- Some argue these experiments are unethical because the participants are not aware they are in a study
- It is difficult to repeat the experiment because the situation/environment will never be exactly the same again
What are field experiments? Give an example.
A field study takes place in a natural environment. The IV is manipulated but extraneous variables cannot be controlled. Participants not necessarily randomly allocated
Example: Bushman
What are the strengths of field experiments?
- Due to the real world setting, results are more likely to relate to real life (mundane realism)
- The participants usually don’t know they’re in a study so their behaviour is more natural
What are the weaknesses of field experiments?
- It is more difficult to control extraneous variables
- Some argue these experiments are unethical because the participants are not aware they are in a study
- It is difficult to repeat the experiment because the situation/environment will never be exactly the same again
What is a lab experiment? Give an example.
An experiment that is carried out in a controlled environment where the IV is manipulated. All other extraneous variables are controlled. Participants are randomly allocated to conditions
Example: Loftus and Palmer
What are the strengths of lab experiments?
- Has a high degree of control
- They are easy to repeat and check the results (high in reliability)
- They can be used to determine cause and effect relationships due to the manipulation of the IV
What are the weaknesses of lab experiments?
- Participants know they are in a study so may guess the aim of the study and change their behaviour to fit accordingly (demand characteristics)
- The experiment is highly controlled so the situations may be seen as unrealistic and artificial
- The experimenter’s expectations can affect the results and participants may be influenced by these expectations (investigator effects)
What are demand characteristics?
A cue that makes participants unconsciously aware of the aims of the study or helps participants work out what the researcher expects to find
What are investigator effects?
Anything that an investigator does that has an effect on a participant’s performance in a study other than what was intended.
How can you reduce investigator effects?
Double-blind designs
What is a single-blind design?
In a single-blind study, the participant is not aware of the research aims. This prevents them from seeking cues about the aims and reacting to them
What is a double-blind design?
Both the participant and the person conducting the experiment are blind to the aims. Therefore the person conducting the investigation is less likely to produce cues
What is experimental realism?
Experimental realism occurs when the task is sufficiently engaging so the participant pays attention to the task and not the fact that they are being observed
What is the target population?
A specific group of people the researcher is often interested in
What is a sample?
A sample is a small group of participants the researcher is interested in representing a target population
What is opportunity sampling?
Recruit those people who are most convenient or most available
What is random sampling?
A sample of participants produced by using a technique such that every member of the target population being tested has an equal chance of being selected
What is volunteer sampling?
Also known as a self-selected sample. To recruit participants, advertisements are placed in a newspaper or on a noticeboard or on the internet
What is systematic sampling?
A sample obtained by selecting every nth person