M119L05-page5 - More precisely: x i i = 1 N = x 1 + x 2 + +...

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(Lesson 5: Measures of Center; 3-2) 3.05 PART B: NOTATION We can label data values x i , where 1 ± i ± N for population data, or 1 ± i ± n for sample data. In Example 1 We have a population data set of size N = 5 . x 1 x 2 x 3 x 4 x 5 80 76 100 83 100 Summation Notation The Greek uppercase sigma, , ± is a summation operator. x ± denotes the sum of the given data values.
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Unformatted text preview: More precisely: x i i = 1 N = x 1 + x 2 + + x N denotes the sum of the values in a population data set, and x i i = 1 n = x 1 + x 2 + + x n denotes the sum in a sample data set. In Example 1 : x i i = 1 5 = x 1 + x 2 + x 3 + x 4 + x 5 ....
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