Experimemtal Design Flashcards
What is an observational/ descriptive research design?
Looks fir pattern, association and correlation
What is manipulative/ experimental research design?
Manipulated conditions, strong design, seeks to prove cause
What are essentials of experimental design?
Clear precise question
Control group
Randomisation
Repetition
What is a hypothesis?
Clear statement articulating a plausible candidate explanation for observations
Why are observation studies easier than manipulative?
Natural settings, less unintended consequences, usually more ethical
What can you control in observational studies?
Time of day
Season
Age
Ethnicity
Observational studies produces what types of data?
Categorical
What is reverse causation?
When B has an affect on A
Why do we need control?
Conservative treatment (doing nothing) Sometimes people get better anyway Tell difference between random change and real treatment effect
What can variation be due to?
NEEDS COMPLETING
Chance
What’s is precision?
The repeatability
What is accuracy?
NEEDDS COMPETING
What is the validity of a measure?
The degree to which any measurement approach or instrument succeeds in describing or quantifying what is designed to measure
What are unsystematic threats to reliability?
Instrument reliability
Data processing reliability
Situational reliability
Observer reliability
