COEFFICIENT 



OF 



VARIATION 





1 









































































































































































CO 



:FFIC 



:iEN 



T Of 



VA 



l\Al 



ON 

















































































































































































— 



























































































0.4 



o5 lo 15 20 .25 3o 35 AO .45 .5o 55 6o 

 COST OF MEASURING PER UNIT (dollars) 



03 



1 o 



.9 



TOTAL SALE 

 VALUE 



( DOLLARS) 



150.000 



lOO.OOO 

 90,000 

 80.000 

 7o,000 

 60,000 



5o,ooo 



4 0,000 



30.000 

 25,000 



20.000 

 1 5,000 



10,000 

 9,000 

 6,000 

 7.000 

 6,000 

 5,000 

 4,000 



3,000 

 2,000 



1,000 



500 



too 



ALLOWABLE 

 ERROR 



(P£RCENT) 

 1 5 



USE OF CHART 



Starting with an appropriate measuring cost on the left-hand graph, 

 move vertically to the appropriate coefficient of variation curve, thence 

 horizontally to axis 1 and establish a point. Connect this point and a 

 point on axis 2 for the appropriate total sale value, with a straight line, 

 and where this line crosses axis 3 establish a point. Connect the point on 

 axis 3 and a point on axis 4 for the appropriate coefficient of variation, 

 with a straight line, and where an extension of this line crosses axis 5, 

 road the allowable error in percent. 



Figure 1. A graph-alinement chart for determining the most economical 

 allowable error in sample scaling and sample tree measuring. 



