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1
Introduction
to
Psych 100A
Fall 2009
Statistics
Lecture 1
Course Objectives
•
Basic understanding of the statistics
used often in psychological research
•
How to think analytically and critically
about research design, analysis methods
and results
•
Learn how to design and analyze a
psychological / behavioral study
Definition: Statistics
•
Numerical properties of groups rather
than individuals.
•
Collection of methods that enables one
to draw reasonable conclusions from
data (Dunn, 1977).
Two major branches of modern statistics
1. Descriptive – deals with techniques for
summarizing and presenting data and is
aimed at clarity (common understanding).
2
Inferentia
deals with methods for
2. Inferential – deals with methods for
assessing uncertainties in inductive
estimates and is aimed at drawing
conclusions from data (inference).
1. Population and parameters
•
Population – collection of objects or persons
with one or more characteristics (variables)
in common.
“
The set of things we wish to
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 Winter '10
 FIRSTENBERG,I.

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