55. Let Il9...9In be independent random variables, each of which is equally likely to be either 0...

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55. Let Il9...9In be independent random variables, each of which is equally likely to be either 0 or 1. A well-known nonparametric statistical test

(called the signed rank test) is concerned with determining Pn(k) defined by P{X=i] =

ç + Ã

/ = 0, 1, . . . , Ë

× = m: Xi < õ

Justify the following formula:

(k-n)

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