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Lecture 3

PSYCH 100A Lecture 3: Psych100A-2-1


Department
Psychology
Course Code
PSYCH 100A
Professor
Reise Steven
Lecture
3

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Tuesday, January 14, 2020
Psych100A Week2
Lecture2-1!
-Fatigue in Cancer Survivors!
Independent variable and dependent variable !
-Change in fatigue: outcome!
-yoga/education intervention: treatment!
Random assignment, but not a random sample!
-Is sample representative for the population — external validity!
Statistics!
-P value: the outcome due to the random chance!
-d: standard deviation!
-Sample v.s. Population!
Distribution Triad!
-Distribution of scores in the population!
-Distribution of scores in the sample (inference) !
-Distribution of sample statistics over repeated experiments (sampling variability)!
Sample distribution is not population!
As N increases, Statistics —> parameters!
Data Generating Process in the Population!
Data generating process <— causes of all the variation <— statistics to reveal!
DGP is unknown to us!
Data —> DGP: bottom-up strategy (from concrete to abstract)!
DGP —> Data: top-down strategy (How probable is your data given your hypo!
Sampling variability!
-The sample result may or may not reflect something!
1
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