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Unformatted text preview: Ex: Take k=2 (1-(1/2^2)) = = 0.75 = 75% in (sample mean 2s, sample mean +2s) Using the Empirical Rule: If something is around 1 SD from the average then its not surprising If something is around 2 SDs from the average then this is fairly unusual If something is around 3 SDs from the average then this is unusual If something is around 4 SDs from the average then this is extreme Z score = (observed value mean) / SD Tells us how far away a value is from the SD How many SDs a value is from the mean...
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This note was uploaded on 04/08/2008 for the course PSTAT 120A taught by Professor Mackgalloway during the Spring '08 term at UCSB.
- Spring '08