40 Records of the Indian Museum. [Vol, XXIII 



nt will be worse. Thus we see that the effect of different unit* 

 iiU^SX " """" ent ***** °* th ^°oiTo) 



We must note however that the Goodness of Fit is a much 

 more sensitive criterion than P.E. in judging the accuracy of aT? 

 We notice that with S.D. = 67-385 (the value Inally ad "ted) P S' 

 which) is substantially better than P = 75 with S.D. = 69 00 mm °' 



c^/x:^:^:^ unit of ***«> * g ™» - 



Note on the Limits of the Unit of Grouping. 



In section 1 we saw that up to a certain unit of ftrouoine 

 winch m our case was 50 mm., the effect of grouping on hf 

 frequency constants were negligible. Let tWs Z f lilt ! 



We'sefn 'tna^ *."* ^ ^' b the P^Tec £ wt 

 >iave been that there is a / oaw limit of grouDin? for »i,m f u 



ttlXZSr*- Let this '- B ^ - - 



should depend «fy on the size of the sample and the S D t 

 will be extremely useful to obtain even a rough idea about A and 

 ft, for any given size of sample " d 



Bernouilh'Tlf Udy i ^ plM ^ m ^mc^y. We must remember 

 sernouilli s law which requires that accuracy should denend on 



*££%£?*" "" t0tal nUmb6r ° f -easuremel P A s d t h 



h m = A\/N and hi = B/VN 

 ing, we get ^ "' ^ *" = 5 ° mm - aud *' = 5° mm - Substitut- 



-4 = 50/^200= 3-53 55 



S = 50. ^200 = 707-10 68 

 I provisionally suggest that 



the ,n!l 5" ''''I;''™ °J SlatWC - Ul calcul «<»>» fluency constants, 

 Uu umi of grouping should be less than ,- 5 vTv 



reJ^ZjlT™ 0l *' lhe '" mt ° ] ermpin " Sh °" ld be 



.nag,!,,;,':.',' 1 ;;' n ; ~n a,,acl ; much vaiue to the ^^ai 



'.l.-o,,, v ,0 ,,, ,- V"'" i° re ; stud ? (,f * singleexample h 

 sum< i, nt. I give the above analysis as a suggestion. 



I his result is 



' *w^ax"Jf ^. i i*sr * h ° s - 



