For the State as a whole, considering sampling and technique 

 errors for the sampled portion and technique errors for the portion 

 covered by complete survey, it is judged that actual areas lie be- 

 tween the following limits: 



In determining timber volume the possible sources of errors, in 

 addition to those cited under "area" include inaccurate measure- 

 ment of sample plots, tree diameters, tree heights, cull, and 

 bias resulting from the improper construction, selection, and 

 use of tree-volume tables. All reasonable effort was made to 

 eliminate errors from these sources. 



Comparison of survey volumes and cutting records indicates that the 

 volume estimates for the area covered by complete survey are 

 slightly low. No allowance has been made for this possible bias. 

 Standard errors of estimate for the portion covered by sampling 

 are 1 3.2 percent or 1 212 million cubic feet for the primary grow- 

 ing stock estimate, t 9.0 percent or I 1,397 million board feet for 

 the live saw-timber estimate. 



For the State as a whole it is judged that the volume estimates 

 lie within the following limits; 



Forest land 



Million acres 



Total 

 Commercial 



Noncommercial and reserved 



22.3 to 22.5 

 15.7 to 15.9 

 6.5 to 6.7 



VOLUME 



Primary growing stock 

 Live saw timber 



16 to 17 billion cubic feet 

 55 to 58 billion board feet 



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