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Unformatted text preview: 2 of 5 1.2 Summation notation 1.2 Summation notation Summation notation. Definition 1.1 The summation sign appears as the greek symbol (capitol sigma) and indicates a sequence of sums. n X i =1 f ( i ) = n X i =1 (expression involving i ) (1) i = 1 Indicates that the index variable is i and starts at 1. n The index variable stops at n . The index variable is always incremented by 1. Example 1 . 5 X i =1 i = 1 + 2 + 3 + 4 + 5 Question 1 . Expand the following expression: 8 X i =5 i 2 1.3 Notation: Greek alphabet & symbols Commonly used greek letters in statistics , , , , , , , , , Hat notation for estimates If we estimate x , we denote it as x ( xhat). A hat over a variable indicates it is an estimate. 1.4 Notation for sets of data In statistics we often deal with sets of data. For example, if we have a class of 5 students we can write their ages as: x = { 21 , 25 , 22 , 21 , 23 } Anthony Tanbakuchi MAT167 Summation Notation 3 of 5 A Alpha N Nu...
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 Spring '11
 Tanbakuchi
 Statistics

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