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chisquare

# chisquare - The Chi Square test next next The chi-square...

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The Chi Square test next next

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The chi-square statistic Say we have a wheel which produces a random vartiable X with We spin it n times and get the data We then let n be de the number of x in this data i i The chi-square statistic is then given by the expression This measures how far n n ... n are from their expected values k 1 2 next next
Given two wheels and two sets of data D1 and D2 how can we decide which wheel produced which data? Wheel A Wheel B next

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Which wheel ? 300 spins of each should tell next
Comparing Chi Square data next

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Using Statistics in Code Breaking next
A histogram of english letter frequencies Table 2. next

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A wheel producing letters of the alphabet with english single letters probabilities next
The Monoalphabetic Cipher There are 40329146112660563558400000 possible keys next THE GUNS OF NAVARONE HAVE BEEN DESTROYED gtd haqi ec qpupreqd tpud vddq wdigrexdw A B C D E F G H I J K L M N O P Q R S T U V W X Y Z p v j w d c h t s k z f n q e y o r i g a u m l x b next

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Known Plaintext attack of a Monoalphabetic cipher next
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A Look at Chi Square Values next
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Frequency analysis of ciphertext next
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