V, FORIvIULA FOR COIiiPUTniG THE CORRELATION COEFFIGIErn' 

 BETVffiEN TREE PLEASURED AND CHECK SCALED YOLUMES 



KMC) _ (£MHLC) 



^ _ n I 



n - I Sc 



v;here r = correlation coefficient 



M = an individual tree volume determined by ttie marker 



G =. the corresponding volume determined by the check 

 scaler 



^ = "the sum of" 



n =. number of pairs of volumes in the sample 

 SL standard deviation of tree measured volumes 

 = standard deviation of scaled volumes 



VI, STRATIFIED SAMPLING 



If'iThen "large" trees are all tallied and the remainder sampled, the allow- 

 able error of the remainder can be larger than has been established 

 for the final result., The following formula adjusts the over-all 

 accuracy (E) for use in this type of sampling o 



= ^ {\) iV 



allowable error (accuracy) of "remainder" group 



total number of trees in sale 



number of trees in the "remainder" group 



mean volume of all trees (determned from 

 cruise data) 



mean volume of all trees in "remainder" group 



where Eg - 

 N ^ 



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