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Unformatted text preview: 1 1 1 2 2 ( ,..., ) n X T X T U T T= . Prove that (a) U is ancillary, and (b) ( for extra points ) U is distributed uniformly over a sphere of radius 1 in ( n 1) dimensional space. Convexity, Jensens inequality 3.5. The geometric mean of a list of positive constants 1 ,..., n x x is t 1/ 1 2 ( ) , n n x x x x = m and the arithmetic mean is the average 1 ( ) / n x x x n = + + m . Show that t x x . 3.6. Show that if f is defined and bounded on ( , ) , then f cannot be convex. 3.7. Let f and g be positive probability densities on R . Show that ( ) log( ) ( ) 0, ( ) f x f x dx g x > unless f g = almost everywhere. This integral is called the KullbackLeibler (KL) information....
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 Fall '08
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 Statistics

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