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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
69Random Variables, Distributions, Moments, and Statistics
A normally distributed sample is symmetric. That is to say, the mean is equal to the median.
Very commonly, the data are not symmetrical; that is, there is higher frequency left or right of the
mean. Two important cases: positive (mean < median) or values biased toward the right and negative
(median < mean) or biased toward the left.
Standard Normal
The standard normal RV, denoted by Z, has zero mean, that is to say μ
z
= E(Z) = 0, and standard
deviation and variance equal to unity, that is to say σ
Z
= 1. We write the pdf as p(Z) = N
0,1
(Z) and
simplify the normal or Gaussian to be
Nz
z
01 ...
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Publisher Resources

ISBN: 9781439885017