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Lecture 1

PSYCH 100A Lecture Notes - Lecture 1: Dependent And Independent Variables, Random Assignment, Internal Validity


Department
Psychology
Course Code
PSYCH 100A
Professor
Reise Steven
Lecture
1

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Thursday, January 9, 2020
Psych100A Week1
Lecture2!
-Anecdotal or Empirical Fact (experiment or observational studies)!
Independent variables: can you randomly control!
Dependent!
Causal attribution !
-Confounding variables?!
Age + activity level —> weight gain!
Pygmalion Eect!
-People behave in a way that is accordance with what is expected for them!
-Teacher expectations have a deep influence on student performance!
Population, representative sample!
Independent/explanatory variable!
Dependent/outcome variable!
Knowing someone’s value on the explanatory variable helps you make a better
guess about their value on the outcome variable!
Sex and violence in TV programs does not serve well as advertisement!
-Sampling!
May or may not like the distribution of the population !
Size N goes up, better reflect the population distribution !
-Experiment v.s. observational study!
-Random assignment v.s. random sampling!
Sampling: everyone in the population has an equal chance of being included in the
sample —> increased generalizability, external validity!
Assignment: everyone has an equal chance of being assigned to each treatment
condition. —> increased internal validity (causation)!
1
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