Psych 100A
Fall 2010
Introduction
to
Statistics
L
t
2
Lecture 2
1

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Types of research designs
•
What type of research design is this study?
• Choices:
Choices:
–Naturalistic observation = observing
behaviors without any intervention
–Archival record = using existing information
(already recorded observations)
–Survey = collecting responses of a group of
individuals
Experiment = carefully controlled situation
–Experiment = carefully controlled situation
where the independent variable is manipulated
and the effect on the dependent variable is
monitored.
2

•
Quantitative Data
Quantitative Data.
The usual table of choice is the
frequency
table
.
•
Data presented in simplified form as
d d t
grouped data.
•
Number of groups or
class intervals
are
decided by common sense and good
judgment (e.g. 6-20 groups).
•
Implied limits
are the boundaries or
endpoints of the class intervals and
d
d
h
f
d
depend on the convention for rounding.
3

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