Haggerty: Studies in Arithmetic 



83 



In every grade the variability was lessened, showing that the 

 children composing the group were much better graded in June 

 than in February so far as this single ability is concerned. 



TABLE IV.— VARIABILITY IN ADDITION, BY PER CENTS 

 (February and June, 1915) 





February 



June 



Attempts 



Rights 



Attempts 



Rights 



Grade 6B 



22 



27 



22 



20 



Grade 6 A 



21 



21 



15 



20 



Grade 7B 



26 



23 



17 



16 



Grade 7 A 



18 



30 



18 



20 



Grade 8B 



21 



28 



22 



17 



Grade 8 A 



21 



20 



18 



15 



The range of variability in attempts and rights in the 20 

 Indiana cities in 1914^ is presented in Table V. Bloomington's 

 variability is included for comparison. 



TABLE v.— VARIABILITY IN ADDITION: BLOOMINGTON COM- 

 PARED WITH TWENTY INDIANA CITIES (May, 1914) 



Variability in Attempts 



Variability in Rights 



20 Indiana Cities I Bloomington 



20 Indiana Cities I Bloomington 





Lowest 



Highest 



February 



June 



■ 



Lowest 



Highest 



February 



June 



Grade 6 



22 



( 



31 \ 



[ 



6B 22 

 6A 21 



22 

 15 



1 



\ 42 



J 



1 



68 i 



[ 



6B 27 

 6A 21 



20 

 20 



Grade 7 



22 



( 



30 \ 



[ 



7B 26 

 7A 18 



17 

 18 



1 



\ 35 



J 



f 



60 i 



[ 



7B 23 

 7A 30 



16 

 20 



Grade 8 



20 



32 ] 



8B 21 

 8A 21 



22 

 18 



i 



[ 32 



J 



r 



63 i 



[ 



8B 28 

 8A 20 



17 

 15 



1 M. E. Haggerty — Arithmetic: A Co-operative Study in Educational Measurements 

 (Indiana University Studies, No. 27). 



