Environmental Engineering Reference
In-Depth Information
TABLE 6.1 I mportant Statistical Symbols and Their Meaning
Symbol
What it is
How is it obtained
µ
Population mean
Add all data points and divide by the number of data points in the
population.
Sample mean
Add all sample data points and divide by the number of sample
data points taken.
s 2
Sample variance
Obtained by taking the difference between the sample mean and
each sample and squaring and dividing by n— 1.
Take the square root of s 2 , the sample standard variance.
s
Sample standard
deviation
H
Hypothesis
The experimenter determines the null and alternate hypothesis.
t
t statistic
Obtained from table of t-values.
F
F statistic
Obtained from table of F- values.
FIGURE 6.1 Total petroleum hydrocarbons (TPH) levels in various areas of a
field.
without the missing data points using a smaller n and n −1. On the other hand, it might be
decided to calculate the missing data points using kriging (described below). In either
case, being able to manipulate the data after they are entered would facilitate these
changes.
 
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