Wie Deutschland seine Schulden bezahlen kann!

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Monograph

Identifikator:: 1830466488

URN:: urn:nbn:de:zbw-retromon-221601

Document type:: Monograph

Author:: Levy, Hermann http://d-nb.info/gnd/117670448

Title:: Der Weltmarkt 1913 und heute

Place of publication:: Leipzig [u.a.]

Publisher:: Teubner

Year of publication:: 1926

Scope:: IV, 116 S.; graph. Darst.

Digitisation:: 2022

Collection:: Economics Books

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Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: III. Die Verringerung des weltwirtschaftlichen Warenabsatzes als Wirkung der verstärkten Selbstversorgung

Collection:: Economics Books

VALIDATION OF MEASURING INSTRUMENTS 173 2g: _ .0049 2s _ .0054 n, n, €: = .0040+.0054 =.0094 €:=.10 Difference in proportions =.80—.50=.30 Since the difference in proportions is 3 times as great as its standard error, it is significant. The formula for comparing the total group with a sub- group by this method is given by Yule (233, p. 271): 2: _ Po Le bh = rtm mm These symbols have the same meaning as in the previous formula, the subscript o referring to the total, r to the sub- group, and 2 to the total minus the sub-group zr. This formula finds use where more than two groups are com- pared. An example is given below. EXAMPLE: Question: Can you do good work while people are looking on? Total Number Proportion Proportion Number Ans. Yes Ans. Yes Not Ans. Yes Successful salesmen 25(n,) 18 72(p1) Average salesmen 50 (ze) 25 Unsuccessful salesmen 40‘ 17 Total 115 60 .52(p,) .48(q,) :s 52-48 9 _ € = “Tis 25 .0078 €nx = .09 Difference in proportions =.72 —.52 =.20 Since the difference in porportions is more than twice as great as its standard error, it is significant. The validity of individual items in any test may be deter- mined in the same manner as the validity of questionnaire items.

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