Psychology Unit 2 - Exam Revision Flashcards
Independent Variable
Variable that is manipulated
Dependent Variable
Variable that is measured
Extraneous and Confounding Variables
Extraneous Variable:
any variable other than the IV that can cause a change in the DV and therefore affect the results in an unwanted way
Confounding Variable:
any variable other than the IV that does have an unwanted effect on the dependent variable, making it impossible to determine which of the variables has produced the change.
Population and Sample
Large group/population v. Small part of a population
Controlled Experiment
An experiment in which only one variable is manipulated at a time.
Experimental and Control Conditions
Experimental Group:
The group of participants who are exposed to the manipulated Independent variable
Control Group:
The group of participants who receive no experimental treatment and serve as a baseline for comparison
Random Allocation
(also called random assignment) is a procedure used to place participants in groups so that they are as likely to be in one group as the other.
IPAD
I = Independent Variable
P = Population
A = A Direction
D = Dependent Variable
Mean, Medium and Mode
Mean (the average):
add all the values and divide the total by the number of values.
Median (the middle number):
if there is an even number of data, take the two middle values, add them together, and then divide by two to obtain the median.
Mode:
The most often occurring value
Describe objective, subjective, primary and secondary data
Objective Data:
Data that is observed and measured independently of personal opinion
Subjective Data:
Data informed by personal opinion or interpretation
Primary Data:
Data collected first hand from a researcher
Secondary Data:
Data collected from others’ prior research
Internal and External Validity
Internal validity:
The degree of confidence that the causal relationship you are testing is not influenced by other factors or variables.
External validity:
The extent to which your results can be generalised to other contexts.
Difference Between a Between Subject Design and Within Subject Design
Between Subject Design:
Each participant is randomly allocated to one group, typically either the control or experimental group.
Within Subject Design:
The same participants are both the experimental and control groups. Must consider order and practice effects.
Limitations of Between Subject Design and Within Subject Design
Between Subject Design:
- needs a large number of participants to ensure that the spread of participant variables in the sample will match the spread in the population.
Within Subject Design:
- Often creates an ‘order effect’ meaning participants do better or worse under the second condition.
- Can take a long time - participants may “drop out”
Ethical Guidelines
- Informed Consent
Before an experiment, the researcher needs to inform the participant of the true nature of the study, what they will be expected to do, their rights and written consent
- Withdrawal Rights
Participants are entitled to withdraw from a study at any time, or to ask to have their results withdrawn
- Confidentiality
Participant right to privacy in terms of access, storage and disposal of informational related to the study
- Deception
Is used in cases where giving participants information about an experiment beforehand might influence their behavior during the study and affect the results
- Voluntary Participation
A participant must voluntarily decide to participate in the research
- Debriefing
Where participants are not fully informed of the study, the researcher must ensure that the participant does not suffer from psychological or physical stress. Participants must always be debriefed
Ethical Considerations
- Beneficence
Maximising benefits and minimising the risks and harms involved
- Integrity
Commitment to searching for knowledge and understanding, and the honest reporting of all sources of information and results
- Justice
The moral obligation to ensure that there is fair consideration of competing claims; that there is no unfair burden on a particular group from an action
- Non- Maleficence
is the principle of avoiding causing harm. If there is harm done.
- Respect
Consideration of participants beliefs and culture, protect participants autonomy and the welfare of human and non-human participants