What is a hypothesis?
An idea that a scientist wishes to test through scientific research
What is a theory?
A set of statements designed to explain a set of phenomena
What is a repeated measures design?
The same participants take part in each condition of the independent variable
What is an independent groups design?
Different individuals take part in each condition (control and experimental groups)
Advantages of repeated measures design
Advantages of independent groups design
What is an independent variable?
The variable we manipulate
What is the dependent variable?
The variable we measure
What is the nominal fallacy?
The belief that one has explained an event simply by naming it
What is the operational definition?
The translation of generalities into specific operations
What is validity?
Validity refers to the appropriateness of a variable - the ability of a test to measure what it is supposed to measure
What is ecological validity?
The extent to which the findings of a study are able to be generalised to the real world
The Barnum Effect
Most people believe that vague personality descriptions accurately reflect their own personality
Who is the Barnum Effect named after?
Phineas T Barnum - a circus showman
Who coined the name Barnum Effect?
Meehl (1956)
Furnham and Schofield
Merrens and Richards
- People have been found to be more accepting of generalised feedback than actual, factual feedback
Stagner
Furnham
Schwartz
What is reliability?
How consistent the results are
What is interrater reliability?
Two raters score a behaviour independently, if their ratings agree then there is a high interrater reliability
What is split-half reliability?
Divide a questionnaire in half and compare the responses in each half, if there is strong agreement in each half then there is high split-half reliability
What is test-retest reliability?
Administering a test at one time and again some time later should yield the same results if the test is reliable