PSYC 1010 Lecture Notes - Lecture 3: Operational Definition, Diazepam, Psychopharmacology

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6 Feb 2015
Department
Course
Professor
Intro to Psychology
September 17, 2013
The Scientific Process
Understanding research methods
Important for critical thinking
Necessary to be sophisticated consumer
Scientific Investigation
1) Formulate a hypothesis
A tentative statement about the relationship between two or more variables
Based on previous research, casual observation, or existing theory
2) Design the study
3) Collect Data
4) Analyze data and draw conclusions
5) Report the findings
Sample:
Hypothesis: Valium impairs memory
Study Design: Experimental design: Randomly assign participants to valium or placebo group
and compare memory abilities
Collect Data: Administer memory tests to 24 participants on Valium and 24 participants on
placebo
Analyze & Interpret Data: Memory performance is worse in Valium group than placebo group.
Interpretation: Valium impairs memory
Report Findings: Publish in a journal (psychopharmacology)
Principles of Research
Operational Definition
Specify the procedures used to measure or control a variable
Can it be counted or scored?
Representative Sample
Resembles the general population on selected variables
Random Sample
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