LEAST SQUARES. 



Values of the factor 0.6745A/ * , 

 \ (n 1) 



TABLE SO. 



/'V 2 

 , for the probable error of the arithmetic mean. 

 , ( i) 



TABLE 51, 



LEAST SQUARES. 



Values of the factor 0.8453\/ ^-=-. . 



\ n(nl) 



This factor occurs in the equation e. = 0.8453 r7= ; for the probable error of a single observation. 



( i) 



LEAST SQUARES. 



TABLE 52. 



Values of 0.8453 



- . 

 1 



This table gives the average error of the arithmetic mean wlien the probable error is one. 



SMITHSONIAN TABLES. 



37 



