Kameralwissenschaften und vergleichende Betriebswirtschaftslehre

Denkschrift über die Maschinenindustrie der Welt, bestimmt für das Komitee B des Vorbereitenden Ausschusses der Internationalen Wirtschaftskonferenz des Völkerbundes

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Monograph

Identifikator:: 1751730271

URN:: urn:nbn:de:zbw-retromon-127610

Document type:: Monograph

Author:: Yule, George Udny http://d-nb.info/gnd/12910504X

Title:: An Introduction to the theory of statistics

Edition:: 8. ed. rev

Place of publication:: London

Publisher:: Griffin

Year of publication:: 1927

Scope:: XV, 422 S; Ill., Diagr

Digitisation:: 2021

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

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Document type:: Monograph

Structure type:: Chapter

Title:: Part II. The theory of variables

Collection:: Economics Books

So THEORY OF STATISTICS. 7. Taking the mean stature for the British Isles as 67°46 in. (the dis- tribution of fig. 49), the mean for Cambridge students as 68:85 in., and the common standard-deviation as 2:56 in., what percentage of Cambridge students exceed the British mean in stature, assuming the distribution normal % 8. As stated in Chap. X1l[., Example ii., certain crosses of Pisum sativum based on 7125 seeds gave 25°32 per cent. of green seeds instead of the theoretical proportion 25 per cent., the standard error being 0°51 per cent. In what per- centage of experiments based on the same number of seeds might an equal or greater percentage be expected to occur owing to fluctuations of sampling alone? 9. In what proportion of similar experiments based on (1) 100 seeds, (2) 1000 seeds, might (a) 30 per cent. or more, (5) 35 per cent. or more, of green seeds, be expected to occur, if ever ? 10. In similar experiments, what number of seeds must be obtained to make the ‘¢ probable error ” of the proportion 1 per cent. ? 11. If skulls are classified as dolichocephalic when the length-breadth index is under 75, mesocephalic when the same index lies between 75 and 80, and brachycephalic when the index is over 80, find approximately (assuming that the distribution is normal) the mean and standard-deviation of a series in which 58 per cent. are stated to be dolichocephalic, 38 per cent. meso- cephalic, and 4 per cent. brachycephalic, 216

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