1
Quantitative Chemical
Analysis
Seventh Edition
Quantitative Chemical
Analysis
Seventh Edition
Chapter 4
Statistics
Copyright © 2007 by W. H. Freeman and Company
Daniel C. Harris
Daniel C. Harris
mean
Standard
deviation

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2
A Gaussian curve in which
μ
= 0
and
σ
= 1. A Gaussian curve whose
area is unity is called a normal error
curve.
In this case, the abscissa,
x
, is
equal to
z
, defined as
z
= (
x
−
μ
)/
σ
.