Der österreichische Exporteur

An Introduction to the theory of statistics

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Monograph

Identifikator:: 1758074884

URN:: urn:nbn:de:zbw-retromon-135614

Document type:: Monograph

Title:: Der österreichische Exporteur

Edition:: [2. Aufl]

Place of publication:: Wien

Publisher:: [Kammer für Handel, Gewerbe und Industrie]

Year of publication:: 1927

Scope:: 240 S.

Digitisation:: 2021

Collection:: Economics Books

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

SUPPLEMENTS—GOODNESS OF FIT. Fev +, Flower, Total. Prickly. Smooth. : : 47 12 £) Violet 48-337 10-663 hi 21 3 “A Shite 19-663 4337 Total . : Here 6 is 1-337, and 1 1 1 1 2 (1-337 | am Gees roses 1337) X= (357) feamr + 10063 T9603 4337 =-708. Turning up this value of x? in the table on p. 385, we find by interpolation P=-400. As stated in the text, the association, negative in this case, is “so small that no stress can be laid on it as indicating anytLing but a fluctuation of sampling.” Precisely the same result can be arrived at by working out the standard error of the difference between the proportions of violet and of white flowers that have smooth fruits, taking the ratio of the difference to its standard error and then using the table of areas of the normal curve. Thus:— Proportion of violet flowers that have smooth fruits, 12/59 or . "2033 Proportion of white flowers that have smooth fruits, 3/24 or : . "1250 Difference . 0783 Proportion of all flowers that have smooth fruits, 15/83 or "1807 Standard error of the difference between proportions of smooth fruits in sampling from a universe in which the proportions are ‘1807 and '8193, and the numbers in the samples 59 and 24 respectively :— bt.) 8193 x 1807 93) = 0932. V X 59 Tog Hence the ratio of the observed difference to its standard error is ‘0783/:0932 or ‘840. 381 i auit at 24 68 15 83

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