LEAST SQUARES. 



Values ol the factor 0.6745\/-^^^ — ;. 



\ u(n— 1) 



This factor occurs in the equation e = 0.6743-1/ -~- — - for the probable error of the arithmetic 



\ h{'i — i) 



Table 50. 



LEAST SQUARES. 



Values of the factor 0.8453\/ — ?^— -,. 



\ »i(u— 1) 



This factor occurs in the equation e^ = 0.845377 for the probable error of a single observation 



y >t{ii — i) 



Table 51 



LEAST SQUARES. 



Values of 0.8453 ,, — - . 

 ny n — 1 



This t.ible gives the average error of the arithmetic mean when the probable error is one. 



Table 52. 



Smithsonian Tables. 



37 



