PS102 Lecture Notes - Lecture 6: Blind Experiment, Observer-Expectancy Effect, Selection Bias

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14 Aug 2016
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Psychology – Lecture 6
Chapter 2 - Research Continued
The cure for experimenter bias and Placebo effect
- Blind and double blind techniques
o Using techniques to blind both the experimenter and the
participants
- Hire research assistants and remove experimenter
Summary of biases
Design concerns
- Selection bias (cure: random sampling/random assignment)
- Experimenter bias (cure: blind/double blind)
- Placebo (cure: exposure)
Limitations
- By controlling so many control variables, creates artificial setting
- Ethical versus unethical
Scientific theories and hypotheses
Theory explains and predicts observed phenomena
Hypothesis falsifiable (can be proven wrong though systematically
observation/ data) and testable prediction
Data systematic observation
- Based on data collected can support the theory or invalidate it
Ethics
Ethical guidelines: Humans
- reasonable incentives
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