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by: Cale Steuber

36

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1

# STT 1810 STT 1810

Cale Steuber
ASU
GPA 3.81

Ross Gosky

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COURSE
PROF.
Ross Gosky
TYPE
Class Notes
PAGES
1
WORDS
KARMA
25 ?

## Popular in Statistics

This 1 page Class Notes was uploaded by Cale Steuber on Friday October 2, 2015. The Class Notes belongs to STT 1810 at Appalachian State University taught by Ross Gosky in Fall. Since its upload, it has received 36 views. For similar materials see /class/217698/stt-1810-appalachian-state-university in Statistics at Appalachian State University.

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Date Created: 10/02/15
St1810 Final Exam Formula Sheet X X X 1 TheMEANofasetofobservationsisXZX n n 171 x l quot i The STANDARD DEVIATION ofa set of observations is S X2 n 11 MEDIAN Arrange all observations from smallest to largest The median M is n1 Ifn is odd M middle value the value Ifn is even M average of the 2 middle values QUARTILES The first quartile Ql is the median of all values smaller than the median of the dataset e second quartile Q2 is the median of the dataset The third quartile Q3 is the median of all values larger than the median of the dataset X J X y Z SCORES If X has a bell shaped distribution then the Zscore is Z or Z if p and o are given Empirical Rule For bellshaped distributions 68 of the observations lie Within 1 std deviation of the mean39 95 lie Within 2 standard deviations of the mean39 997 lie Within 3 standard deviations of the mean Outlier Detection Rule Any observation larger than Q3 151QR or smaller than Q1 7 151QR can be considered an outlier Formulas for Twoway Tables Marginal Distribution overall distribution of a variable Conditional Distribution distribution of a variable in a specific category of another variable Relative Risk Risk in Categog 1 Risk in Category 2 Odds of an event occurrences of the event39 times it does not occur or more generally probabili an event occurs probability it does not occur Odds Ratio Odds of occurrence for categog 1 Odds of occurrence for category 2 Ch S St f f X2 observedcount exp ectealcoum2 1 quare a1s 1c all ME My expectedcount where the expected cell count in any cell is Row TotalXColumn TotalTable Total X2 is considered large when it s at least 384 for a 2X2 table

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