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Unformatted text preview: CHAPTER 3 SUMMARY Measurers of Central Tendency: Population Mean: 1 N i i X N = = Sample Mean: 1 n i i X X n = = Where 1 n i i X = is the sum of individual values, N is population size, n is sample size. Median = Middle value if n (or N) is odd, the mean of the middle 2 values if n (or N) is even. Mode(s): The most frequent value(s). Measures of Dispersion: Range = Maximum Minimum. Variance of Population: 2 1 2 2 2 1 1 ( ) N i N N i i i i i X X X N N N = = = -- = = Variance of Sample: 2 1 2 2 2 1 1 ( ) 1 1 n i n n i i i i i X X X X n s n n = = = -- = =-- Standard Deviation of Population: 2 1 2 2 2 1 1 ( ) N i N N i i i i i X X X N N N = = = -- = = = Standard Deviation of Sample: 2 1 2 2 2 1 1 ( ) 1 1 n i n n i i i i i X X X X n s s n n = = = -- = = =-- Empirical Rule: 68% of a normal data set are between 1 - and 1...
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This note was uploaded on 01/07/2012 for the course MATH 1342 taught by Professor Lisajuliano during the Fall '12 term at Collins.
- Fall '12