_GENERAL DOCUMENTS - C1981017 ‎(229)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎ 1999 Correspondence
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

1999 Noxious Weed Density Summary*
Sutey Reference Area#1
Transect #Thistles/sq.m. #Houndstongue/sq.m. Total/sq m.
1 15.9 0.1 16.0
2 12.9 0.4 13.3
3 16.9 0.2 17.1
4 13.9 0.3 14.2
5 21.6 0.9 22.5
6 15.6 1.5 17.1
7 15.5 3.1 18.6
8 10.6 1.2 11.8
9 10.0 1.1 11.1
10 6.5 1.1 7.6
Thistle sample mean= 13.9 plants per square meter
Houndstongue sample mean=0.9 plants per square meter
Noxious total= 14.9 plants per square meter
19998/1999 Thistle Density Comparison
Sutey Reference Area#1
1998 Data
Sample mean..............17.5 plants per square meter
True mean..................15.3<U<19.7; 80%C.I.
1999 Data
Sample mean.............13.9 plants per square meter
True mean.................12.1<U<15.7;80%C.I.
Thistle density sample mean decreased between years,however the difference was not statistically
significant,even at the 80%level of statistical confidence(alpha=0.2;2 tail, 9dfi.
• Thistle species included bull thistle(Cirsium vulgare),plumeless thistle,Canada thistle,and musk
thistle. No attempt was made to separately count each species. Houndstongue was present both years,
but was counted only in 1999.