PERMFILE130512

• Permit No: C1984065
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: 3.6 VEGETATION INFORMATION
• Media Type: D
• Archive: No

1. Determining Standard Deviations
Cover and Production
(X1-X)Z
s' OR
n-1
where
Density
( 1-D) 2
s-
n-1
Xi = sample mean per quadrat in the ith enclosure or transect
X' II ~g@~~1Y ~fiBSnapFPi~iadrat
~' ~f ovabeilod~eencfosuseq¢tgtAnaecgg¢ or density points
= standard deviation
i
2. Estimating Ade4uate Sample Size
Cover and Production
2 (sz) z
nmin2 ( (~7C) 2
OR
Density
2 (sz) a
nmia2 (~) z
(8)
(9)
nmin =minimum number of clipping quadrat, cover transects or density
points in this vegetation type
S = sample standard deviation
Z = the z statistic (1.28 for cover and O.B4 for production and
density
d = amount of reduction it is desired to detect (0 .1 for cover and 0.2
for production and density)
~ sample mean of production per quadrat or percent cover per
C

NCEC - Coal Ridge #1 3-70 ABC/1145/900301