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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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 Summer '07
 AllStats145
 Statistics

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