58 TABLE 27.- LEAST SQUARES. 



Values of the factor 0.6745A/ (>< 1 _ 1) - 

 This factor occurs in the equation r =o.6745A/ ' - for the probable error of the arithmetic mean. 



TABLE 28. -LEAST SQUARES. 



Values of the factor 0.8453\/ y- 1 - 



\ ?i\?i xj 



This factor occurs in the approximate equation r =0.8453 ( for the probable error of a single observation. 



( / ) 



TABLE 29. -LEAST SQUARES. 



Values of 0.8453 r 



This factor occurs in the approximate equation r n =: 0.8453 



n 1 



for the probable error of the arithmetical mean. 



SMITHSONIAN TABLES. 



