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On a property of the mean ranges in samples from a normal population ang on some integrals of Prof. T. Hojo. (Q558804)

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scientific article; zbMATH DE number 2546699
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English
On a property of the mean ranges in samples from a normal population ang on some integrals of Prof. T. Hojo.
scientific article; zbMATH DE number 2546699

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    On a property of the mean ranges in samples from a normal population ang on some integrals of Prof. T. Hojo. (English)
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    1933
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    In Anschluß\ an \textit{T. Hojo} (1931; F. d. M. \(57_{\text{I}}\), 633) und \(K\). und \textit{M. S. Pearson} (1931; F. d. M. \(57_{\text{I}}\), 633) leitet Verf. eine interesante Beziehung zwischen den mittleren Abständen \(w_m\) des größten und kleinsten Elements von Stichproben von der Größe \(m\) aus einem Kollektiv mit \textit{Gauß}scher Verteilung ab. Ist \[ \alpha _x=\frac {1}{\sqrt {2\pi }}\int \limits _{-\infty }^{x} e^{-\tfrac 12x^2}dx \quad \text{und} \quad w_n=2m\int \limits _{0}^{1} x\alpha _x^{m-1}d\alpha _x, \] so gilt \[ \begin{gathered} \frac {w_{2m+1}}{4m+2}-C_m^1\frac {w_{2m}}{4m}+C_m^2\frac {w_{2m-1}}{4m-2} -\cdots +(-1)^m\frac {w_{m+1}}{2m+2}=0\\ \left ( C_m^h=\frac {m!}{h!(m-h)!}\right ), \end{gathered} \] wobei angenommen wird, daß\ der Mittelwert der \textit{Gauß}schen Verteilung 0 und die Streuung 1 ist. Die Verwendung dieser Beziehung führt zu einer wesentlichen Vereinfachung der zahlenmäßigen Auswertung der in den genannten Arbeiten erhaltenen Ergebnisse.
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