Association
Stemplot
Bar Graph
Used to display the distribution of a categorical variable or to compare the sizes of different quantities. The horizontal axis of a bar graph identifies the categories or quantities being compared. Drawn with blank spaces between the bars to separate the
Boxplot
Categorical Variable
Places an individual into one of several groups or categories
Conditional distribution
Describes the values of one variable among individuals who have a specific value of another variable. There is a separate conditional distribution for each value of the other variable.
Data Analysis
Dotplot
Distribution
Tells what values a variable takes and how often it takes these values
Histogram
Individuals
Inference
Interquartile Range
IQR=Q3-Q1
The marginal distribution of one of the categorical variables in a two-way table of counts is the distribution of values of that variable among all individuals described by the table.
Mean
Median M
Mode
Multimodal
Outlier
In any graph of data, look for the overall pattern and for striking departures from that pattern. Shape, center, and spread describe the overall pattern of the distribution of a quantitative variable.
Pie Chart
Quantitative Variable
Range
Used to compare the distribution of a categorical variable in each of several groups. For each group, there is a single bar with "segments" that correspond to the different values of the categorical variable. The height of each segment is determined by th
Used to compare the distribution of a categorical variable in each of several groups. For each value of the categorical variable, there is a bar corresponding to each group. The height of each bar is determined by the count or percent of individuals in th
Skewness
Stemplot
Symmetry
If the right and left sides of a graph are approximately mirror images of each other.
Third quartile Q3
Unimodal
Variables
Any characteristic of an individual. A variable can take different values for different individuals.