Haggerty: Studies in Arithmetic 



109 



Comparison of Speed and Accuracy. — That the practice did not 

 train in speed at the expense of accuracy is shown by a comparison 

 of the May medians of the practiced group with the Indiana 

 medians in attempts and rights {Indiana University Bulletin, 

 Vol. XII, No. 18). Table VII shows the per cent of superiority 

 of the practiced groups over the Indiana median in attempts and 

 rights. This superiority is greater in rights than it is in attempts, 

 being especially marked in the fifth grade. Only at one place — 

 sixth grade addition — is the superiority in attempts higher. 



A study of Table VIII showing the Indiana medians of de- 

 pendability and that of the practiced groups in May gives similar 

 results. 



TABLE VIL— COMPARISON OF INDIANA AND PRACTICED 



GROUP MEDIANS 





Attempts 



Rights 



Excess 

 of su- 

 periority 

 in 

 rights 

 over 

 at- 

 tempts 



Indiana 

 Median 



Prac- 

 ticed 

 Median 



Per 

 Cent 

 Su- 

 periority 



Indiana 

 Median 



Prac- 

 ticed 

 Median 



Per 

 Cent 

 Su- 

 periority 



Gkade 5 

















Addition 



6.6 



8.6 



30 



3.6 



6.5 



81 



51 





7.3 



8.8 



21 



5. 



6.8 



36 



15 



Multiplication. , , . 



6.3 



7.5 



19 



3.9 



5.8 



49 



30 



Division 



4.5 



5.7 



27 



2.6 



3.5 



35 



8 



Grade 6 

















Addition 



7.4 



12.5 



69 



4.4 



6.5 



48 



—21 





8.9 



14.5 



63 



6.5 



11.2 



72 



9 



Division 



5.7 



8.8 



54 



4.8 



7.5 



56 



2 



