1
Hypothesis Testing
LIR 832
Lecture #3
January 30, 2007
Topics of the Day
A. Our Fundamental Problem Again: Learning About Populations from
Samples
B. Basic Hypothesis Testing: One Tailed Tests Using a Z Statistic
C. Probability and Critical Cutoff Approaches: Really the Same Thing
D. How do we do hypothesis tests on small samples (n = 30 or less).
E. How do we do hypothesis testing when we have information on
population standard deviation?
On sample standard deviations?
F. How do we test a statement such as (two tailed test)?
G. How do we test for differences in means of two populations?
µ
µ
≥
≤ −
25
6
or
X
=
µ

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