PSYC104 Lecture Notes - Lecture 7: Experiment, Random Assignment, Research Question
18 Jun 2018
School
Department
Course
Professor
Experiments
Conducting Research
1. Research question
2. Generate hypothesis
3. Operationalise (measure what how who)
4. Conduct the study
5. Collate data
6. Analyse data
Possibility of an Experiment
1. Can the key variables be controlled?
2. Can the variables of interest be manipulated?
3. Can participants be randomly assigned to groups?
4. The dependent variables must be measurable or quantified
5. The independent variable must be manipulated to determine causality
Key Concepts
A true experiment is based on the assertion that the independent variable
causes the variation in the dependent variable
Groups are used to represent the different amounts of the independent
variable
Must have a control group as a comparison
Experimental Design
True Experiments
Consist of groups differing on levels of the independent variable
Random allocation of participants
Single independent variables (2/3 levels)
Quasi Experiments
No random assignment of participants
Control groups are used to apply the independent variable
Participants in Treatment Group
Between Subjects
Each participant required to complete experimental tasks
Can span over a number of occasions
Within Subjects
Participants required to undertake experimental tasks more than once
Tests the treatment effectiveness and impact
Conducting Experiments
The hypothesis
NULL (H0) means no link between culture and reasoning
ALTERNATE (H1) means link does exist
Conclusion
TENTATIVELY ACCEPT (H1) there is a link between culture and the
resolution
Aims to establish a causal relationship between variables
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Document Summary
Conducting research: research question, generate hypothesis, operationalise (measure what how who, conduct the study, collate data, analyse data. A true experiment is based on the assertion that the independent variable causes the variation in the dependent variable. Groups are used to represent the different amounts of the independent variable. Must have a control group as a comparison. Consist of groups differing on levels of the independent variable. Control groups are used to apply the independent variable. Each participant required to complete experimental tasks. Can span over a number of occasions. Participants required to undertake experimental tasks more than once. Null (h0) means no link between culture and reasoning. Tentatively accept (h1) there is a link between culture and the resolution.
