100AHW6

# 100AHW6 - STAT 100A HWVI Due next Wed Problem 1 Suppose we...

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STAT 100A HWVI Due next Wed Problem 1: Suppose we flip a fair coin n times independently. Let X be the number of heads. Let k = n/ 2 + z n/ 2, or z = ( k - n/ 2) / ( n/ 2). Let g ( z ) = P ( X = k ). (1) Using the Stirling formula n ! 2 πnn n e - n , show that g (0) 1 2 π 2 n . a b means that a/b 1 as n → ∞ . (2) Show that g ( z ) /g (0) e - z 2 / 2 as n → ∞ . (3) For two integers a < b , let a 0 = ( a - n/ 2) / ( n/ 2), and b 0 = ( b - n/ 2) / ( n/ 2). Show that P ( a X b ) R b 0 a 0 f ( z ) dz , where f ( z ) = 1 2 π e - z 2 / 2 . (4) Let Z = ( X - n/ 2) / ( n/ 2). Show that P ( a X b ) = P ( a 0 Z b 0 ). Argue that in the limit Z N(0 , 1). Problem 2: Suppose Z N(0 , 1). Calculate E[ Z ] and Var[ Z ]. Problem 3: Suppose we flip a fair coin 1000 times independently. Let
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