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STA261 Exam 1 Cheat Sheet
Kimberly Glennon
Data:
pieces of information about individuals organized into
variables:
a particular characteristic, can be
quantitative or categorical.
Dataset
: a set of data identified with particular circumstances. Done in tables, rows=indiv, columns=vars
Exploratory Data Analysis is how we make sense of data by converting it from raw form to informative.
Graphical displays for distribution of C data: pie chart and bar chart
Graphical displays for distribution of Q data: histogram, stemplot, and boxplot
Histogram Interpretation
:
Shape
: symmetry/skewness and peakedness/modality (uniform, uni or bimodal)
,
Center
: midpoint
,
Spread
: called variability, approx.
. range covered by the data. Range=MaxMin
Outliers:
observations that fall outside the overall pattern
Stemplot
: leaf is right most digit, stem is everything else. Preserves original data and sorts it. Dotplot sim.
Mean
: average of a set of observations. Add all up and divide by #. Symbol is xbar. Sensitive to outliers.

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 Fall '08
 BEAL

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