TABLE 26. -LEAST SQUARES. 



Values ol the factor 0.6745-^ n( J' 



This factor occurs in the equation r =o-(>74S\l , V _\ for the probable error of the arithmetic mean. 



TABLE 27. -LEAST SQUARES. 



Values of the factor 0.8453- 



iV 



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



Y n (n / ) 



TABLE 28. -LEAST SQUARES. 



Values of 0.8453 

 n\n 1 



This factor occurs in the approximate equation 7-00.8453 , for the probable error of the arithmetical mean. 



SMITHSONIAN TABLES. 



