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Statistics
Chapter 1
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Terms in this set (25)
Individual
OBJECTS described by a set of data (may be people, animals, or things)
Variable
any characteristic of an individual
Categorical data
Individual OBSERVATIONS are qualitative
Categorical variable
Places an individual into one of several groups or CATEGORIES
Quantitative variable
Takes NUMERICAL VALUES for which it makes sense to find an average
Distribution
Shows the values of a variable and how OFTEN these values occur
Bar chart
A graph of frequency distribution for a categorical data set
Pie chart
Shows the distribution of a categorical variable as pieces of a PIE based on each categories percent of a whole
Marginal Distribution
Of one of the categorical variables in a two-way table or counts in the DISTRIBUTION of values of that variable among ALL individuals described by the table (OUTSIDE)
A conditional distribution
Of a variable describes the values of that variable among individuals who have a specific value of another variable. There is a separate CONDITIONAL DISTRIBUTION for each value of the other variable (inside)
Association
Knowing the value of one variable helps PREDICT the value of the other
Two-way table
Of counts- ORGANIZES the data about TWO categorical variables measured for the same set of individual
Frequency table
Displays the count of OBSERVATIONS in each category or class
Relative Frequency Table
Shows the PERCENT of observations in each category or class
Dot plot
A graph of numerical data in which each observation is represented by a DOT on or above a horizontal measurement scale
Symmetry
The right and left sides of a graph are appropriately MIRROR images of each other
Skewed to the right
(Positively skewed) the tail of the data je heading off to the RIGHT
Skewed to the left
(Negatively skewed) the tail of the data is heading off to the LEFT
Stemplot
A simple graphical display for fairly SMALL numerical data sets
Histogram
Displays the distribution of a quantitative variable
Unimodal
Quantitative data with only ONE peak
Bimodal
Quantitative data with TWO clear peaks
Multimodal
Quantitative data with MORE than two clear peaks
SOCS
Shape, Outlier, Center, Spread
Range
The value of the maximum less the minimum
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