808
TURNER
39
TTT) Toole
25
J
ox-
4
20 -—-
—
ba
4
4
_
|
-
br
PENOYER VALLEY
1
D+15
10
5
2
TTT TTT
0
RAILROAD VALLEY
D+20
4
0
30
pepirr tr
60
LI
90 120 150 180
0
<
W
we OTT TTT TT Tt TT
a
4
_
_
Li
8B
1
24
32
Lm
40
TTT TT TTT
a 35k
=
_
—
30
_
_
4
25
am
LE
=
>
>
7
20
CURRANT AREA
+25
Job
|
GROOM VALLEY
D+ 30
4
St
4oo-
4
Io
4a
OF
4
4
L
—
5p
en
0
24
48
72
NC
96
120
0
pitt ty
40
80
ey
120 160 200
NC
Fig. 3—Four synthetic distributions of 100 cases based on measurements of 'I in vegetation samples from four areas in southern Nevada.
70 distributions were generated by the computer — some based on !3"1
measurements of stomach contents and others on measurements of
1] in bulk samples of plants—and all were skewed. When the loga-
rithms of the values were plotted, the curvestended to be symmetrical.
Figure 5 shows the frequency distribution of the logarithms of the
numbers tabulated in Fig. 3 as Groom Valley D + 30. Whenthis distribution is compared to a normal distribution with the same mean and
variance, the total X’, with seven degrees of freedom, is 5.30 (X} 95 =
14.07).
Statistical attributes of 24 synthetic distributions are shown in
Table 3. As may be seen, the fractions of these populations exceeding