. The Bell System technical journal . fdefectives in A samples of n in number will he represented b\ thedistribution of X{p-\- found lo possess a gi\en al iriliute, *• Pearson, K. Luc. cit. 1-uut note 31). . iril)Utii>ii of till ^is to !«• i-xiK-cli-d in 1,000 Mich-Kiiiipli-s is iiulioatod l)\- llu- last rolumii of fri(iuiiu;ics in IaMi- onliT to show i;ra|)hifall\- how lliis (listrii>ution ditlVrs from that I. Fig. 13 rorrispoiKJini; to the expansion these two sets of frequenciesare reproduced in Fig. 13. The ditiference between them is a strikin
. The Bell System technical journal . fdefectives in A samples of n in number will he represented b\ thedistribution of X{p-\- found lo possess a gi\en al iriliute, *• Pearson, K. Luc. cit. 1-uut note 31). . iril)Utii>ii of till ^is to !«• i-xiK-cli-d in 1,000 Mich-Kiiiipli-s is iiulioatod l)\- llu- last rolumii of fri(iuiiu;ics in IaMi- onliT to show i;ra|)hifall\- how lliis (listrii>ution ditlVrs from that I. Fig. 13 rorrispoiKJini; to the expansion these two sets of frequenciesare reproduced in Fig. 13. The ditiference between them is a strikingillustration of the signifirance of the size of the samples used in con-nection with the inspection of equipment, providing we accept Pear-sons results. Deviation of Random Samples from AverageConditions and Significance to Traffic Men By E. C. MOLINA and R. P. CROWELL THK traffic executive deals with questions which lead him intothe consideration of problems of widely differing natures. Atalmost every turn he is confronted by the fact that his decisions andprograms in relation to these different phases of the work must bebased on records which are seldom continuous and in most cases aremerely samples. These sample records are assumed to measurethe characteristics of the entire volume of facts or data of which theyare taken to be representative. In the use and analysis of theserecords there are a number of perplexing questions which come
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
