XIII.—SIMPLE SAMPLING OF ATTRIBUTES. 
TABLE showing Frequencies of Registration Districts in England and Wales with 
Different Ratios of Male to Total Births during the Decade 1881-90, for 
Groups of Districts with the Numbers of Births in the Decade lying between 
Certain Limits. [Data based on Decennial Supplement to Fifty-fifth Annual 
Report of the Registrar-General for England and Wales.) 
Number of Births in Decade. 
Male Births : 
per Thousand 155, 3500 | 4500 (10,000 15,000 | 30,000 | 50,000 { 
Total Births, to to to to | to to | to | 
2500. ' 4000. ! 5000. '15,000. 20,000.| 50,000. 90,000. 
466-67 : > - oe _ = 
482- 3 = et [ee — = 
492- 3 -- = = = —_ 
494-5 : ER = —_ 
496- 7 = 5 : — 
498- ¢ — 
500-1 2 — 
502- ¢ - 
504-5 l fi 
506-7 lu 
508- 9 : ie 1 
510-1 ¢ : 
512- 3 
514-5 — 
516- 7 J 
518-9 - 
520-1 so 
522-7 : 
524-1 . 
526- 7 } 
528-9 ox 
530-1 
532- 3 _ 
534-5 
536- 7 
Total 36 FR : 52 35 
Mean 5082 5 °5 | : 5 '= 0 |5078 | 
Standard deviations 12:8 8:53 I: | e22| 220] 
Theo. st. deviation 
corresponding to} 11-2  8'16 iF 2:50 | 1-89 
mean births s; 
Na 6:2055 D 3iES1-1 
* The meaning of this expression is explained in § 10 of Chap. XIV, 
263