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Data Analysis and Statistics for Geography, Environmental Science, and Engineering
book

Data Analysis and Statistics for Geography, Environmental Science, and Engineering

by Miguel F. Acevedo
December 2012
Beginner content levelBeginner
557 pages
19h 5m
English
CRC Press
Content preview from Data Analysis and Statistics for Geography, Environmental Science, and Engineering
110 Data Analysis and Statistics for Geography, Environmental Science, and Engineering
4.5 PARAMETRIC METHODS
4.5.1 Z test or stanDarD norMal
We use this parametric method to test whether the sample mean is different from the population
mean (parameter). It assumes a known distribution (normal) with known parameters mean μ
X
and
variance = σ
X
2
. We build the statistic z by the ratio of deviations of the sample mean from hypotheti-
cal or population mean to the standard error σ
e
.
Z
XX
n
X
e
X
X
=
=
−µ
σ
µ
σ /
(4.12)
The null hypothesis is H0: X
= μ
X
. If z is large for given α, then reject H0; if the z value indicates
that H0 cannot be rejected, then there is ...
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Publisher Resources

ISBN: 9781439885017