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Psychology Methodology 2
Notes for a research proposal
25
Psychology
Undergraduate 3
03/09/2010

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Term
Correlation Coefficient
Definition
 Correlation between variables, if 0 then no correlation.  The higher the number (between 0 and 1) the stronger the correlation.
Term
Experiment
Definition
A design where the researcher has control of the independent.
Term
Effect Size
Definition
A measure of the difference between two populations.
Term
Internal validity
Definition
Evaluates the extent that the independent variable caused the changes or differences in the dependent variable.
Term
External Validity
Definition
Evaluates the extent that the results can generalize to other populations and settings.
Term
Confounding variables
Definition
Any circumstances that changes systematically as the dependent variable is manipulated.
Term
Random assignment
Definition
An independent assignment of participants to groups.  
Term
Repeated measures designs
Definition
In experimental design, a dependent groups design where more than one measure has been taken on the same individuals.
Term
Types of rating scales
Definition
Restricted/fixed alternative.  Partially open-ended and open-ended.
Term
Social Desirability
Definition
A problem possibly faced when conducting an experiment that a participant will respond in a manner that puts them in a better light. 
Term
Nominal variables
Definition
No quantitative properties
Term
Ordinal Variables
Definition
Order levels from lowest to highest/rank order data
Term
Interval variables
Definition
Quantitative properties, intervals between levels are equal in size.
Term
Ratio variables
Definition
Quantitative
Term
Inter-rater
Definition
Correlation between raters or observations
Term
Test-retest
Definition
assesses temporal stability, same test twice with the same people 
Term
Internal consistency (e.g., split half cronbach's alpha)
Definition
Assesses reliability between items of a measure.
Term
Face Validity
Definition
it seems to be a reasonable measure of a variable, e.g. ask panel of experts.
Term
Construct Validity
Definition
Evaluates the adequacy of the operational definiton
Term
Observational measurements
Definition

Accuracy - Related to performance

Frequency - How much

Duration - How long

Latency - Until when

amplitude - How intense

Term
Graphic rating scale
Definition
Two options e.g. Shrewed to Gullible then put a marker as to where you feel you personality falls
Term
Close ended/open ended questions
Definition
Close ended - response categories, easy to analyze.  Open-ended ansers are not restricted
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