Table 1. — Sample sizes needed for accuracies of 2,5 percent ^ based on 



scale book samples; all values adjusted for a sale size of 2,000 

 trees for ease in making comparisons e 



Unrestricted 

 sampling 



-All large trees 1/ measured 



-- remainder sampled 



Coefficient 

 of 



variation 



Sample 

 size 



Coefficient 

 of 



variation 



Sample 

 size 



Large 

 trees 



Total of sample 

 and large trees 



Percent Number 



Percent 



Number Number 



Number 



PONDEROSA PINE 



49 



320 



36 



100 



162 



262 



64 



500 



53 



289 



93 



382 



65 



513 



50 



214 



175 



389 



67 



525 



52 



244 



91 



335 



72 



584 



58 



280 



142 



422 



74 



588 



60 



320 



104 



424 



75 



625 



68 



510 



15 



525 



77 



643 



70 



500 



25 



525 



79 



666 



62 



303 



81 



384 



81 



688 



59 



340 



69 



409 



TOSTEEN LARCH 



49 



320 



41 



179 



86 



265 



52 



358 



46 



239 



95 



334 



57 



413 



52 



308 



56 



364 



58 



424 



47 



263 



36 



299 



64 



500 



57 



370 



45 



415 



72 



584 



62 



357 



129 



486 



74 



588 



61 



385 



39 



424 



79 



666 



68 



476 



44 



520 



81 



688 



54 



175 



231 



406 



DOUGLAS -FIR 



58 



424 



45 



217 



42 



259 



58 



424 



47 



217 



90 



307 



59 



435 



52 



263 



27 



290 



60 



447 



48 



278 



33 



311 



67 



525 



51 



286 



43 



329 



68 



535 



58 



357 



72 



429 



70 



555 



63 



400 



73 



473 



88 



770 



62 



263 



157 



420 



93 



833 



78 



455 



92 



547 



IT Large trees are about the upper 10 to 20 percent on the average 

 ~ small sale. See iippendix VI for methods of determining the num.ber 

 of large trees to tally completely, 



-12- 



