TJic Degree of Aecuracy of Siatisiical Data 13 



CASK I 



Mr. Elderton's table for x"=2.5 and ?z=:io gives P=.gS about. 



CASE II 



Mr. Elderton's table gives P'==.49 about. 



Thus, although the second set of observations has a less per- 

 centage error in frequency' than the former, its probability is 

 only half as large. This difficulty is partially obviated by divid- 

 ing x'"' t>y the square root of the ratio of the two frequencies and 



entering the table with this new value of x'"- 

 gives no absolute measure of the probability. 



This, however, 

 When, therefore. 



99 



