M119L06-page8

# M119L06-page8 - formula is preferred for maximum accuracy...

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(Lesson 6: Measures of Spread or Variation; 3-3) 3.22 Note 3: Triola on p.94 provides the following alternate formula, which is much harder to remember but is more often used in computers and calculators: s = n x 2 ( ) x ( ) 2 n n 1 ( ) This formula is algebraically equivalent to the previous one. It is a one-pass formula in that a computer or calculator does not need to use the data values more than once. In particular, the sample mean does not have to be computed first. (The previous formula is a two-pass formula.) This latter
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Unformatted text preview: formula is preferred for maximum accuracy in that it does more to avoid roundoff errors. Example 2 We will modify Example 1. Let’s say 1000 students in a large lecture class have taken a test. Five of the tests are randomly selected, and their scores are as follows: 80 76 100 83 100 Find the sample VAR and SD of the given data set. Population (Size 1000) ↓ Sample (Size 5)...
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## This note was uploaded on 12/29/2011 for the course MATH 119 taught by Professor Kim during the Fall '09 term at SUNY Stony Brook.

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