Haggerty : Study ix Arithmetic 



473 



grade to grade within a single city than in the ease of either 

 medians or Yariabilities. Comparing the rankings of the cities in 

 dependability with their standing in medians there is an inverse 

 correlation of A6 (method of rank differences). This means that 

 a considerable number of the cities with hieh median scores 



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have low rank in dependability, and that some cities with Ioav 

 median scores have high rank in dependability. That the corre- 

 lation is less than .50 indicates that the inversion is far from 

 absolute. Some cities Adth fairly high medians also have high 

 dependability. City 3 is a case in point with rank 4 in medians 

 and rank 2 in dependability. 



