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Test for randomness : Chi square test

Test for randomness : Chi square test. We can say how probable or improbable certain types of events are. The difference between observed Y s and expected np s V = (Y 2 – np 2 ) 2 + (Y 3 – np 3 ) 2 + … + (Y 12 – np 12 ) 2 What is the probability what V is this high using true dice?.

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Lecture 6 STREAM CIPHER SYSTEM

Lecture 6 STREAM CIPHER SYSTEM. By: NOOR DHIA AL- SHAKARCHY 2012-2013. STREAM CIPHER SYSTEMS. X 2 =. Statistical Tests: 1-frequency test:. 0 &lt; x 2 &lt; 3.84. n = length of sequence. n0= number of 0's in sequence. n1= number of 1's in sequence. X 2 =. 2- serial test:. x2 ≤ 5.99.

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