Exam 1 Cheat Sheet

Exam 1 Cheat Sheet - Statistics Summer 2007 Exam 1 Cheat...

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Statistics Summer 2007 Exam 1 Cheat Sheet Individual : The objects described by a set of data. Variable : Any characteristic of an individual. Categorical : Places and individual into one of several groups or categories. Quantitative : Takes numerical values for which arithmetic operations such as adding and averaging make sense. Usually recorded in a unit of measurement. Distribution : What values it takes and how often it takes these values. Outliers : Observations that lie outside the overall pattern of a distribution. Median : The midpoint of a distribution, the number such that half the observations are smaller and the other half are larger. Resistant to changing outliers. Mean : The ordinary arithmetic average. Sensitive to changing outliers. Variance : An average of the squares of the deviations of the observations from their mean. Standard Deviation : Tells you how far apart the observations are from their mean. 5 Number Summary : o Min o Q1 o Median o Q3 o Max I nter Q uartile R ange: The range between quartiles. IQR Rule for Outliers : If the suspected outlier is X amount above or below Q1 or Q3 then: Four Steps for a Statistical Problem : State, Formulate, Solve, and Conclude. Density Curve
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Exam 1 Cheat Sheet - Statistics Summer 2007 Exam 1 Cheat...

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