This document discusses different types of graphical displays used to represent univariate data including stem and leaf plots, histograms, dot plots, bar graphs, pie charts, and box plots. It describes what each graphical display is and the types of data each can represent such as categorical data represented by pie charts and bar graphs, and numerical data represented by dot plots, stem and leaf plots, histograms, and box plots. Finally, it explains that graphical displays are often used to compare similar data sets and provide an example of comparing graphs from previous years in business to predict performance for the current year.

1. GRAPHICAL
REPRESENTATIONS OF
UNIVARIATE DATA
By: Natasha Farrow

2. TYPES OF GRAPHICAL DISPLAYS
Stem and Leaf Plots
Histogram
Dot Plots
Bar graphs
Pie Charts
Box Plots

3. STEM AND LEAF PLOT
Stem and leaf plots organize data from least to greatest.
The stems and leaves are formed from the digits in the data.
HISTOGRAMS
Uses bars to represent the frequency of the data.
Data is distributed into even and continuous intervals.

4. BAR GRAPHS
Very similar to histograms. Use dots to represent the frequency of
the data.
Data is separated into even, continuous intervals.
DOT PLOTS
 Uses display the category of data
 Bars are used to represent the quantities of the data.

5. PIE CHARTS
 Shows relationships of parts of a whole.
 The circle is considered the whole (100%) and the parts show their
individual percentages.
BOX PLOTS
 Made using the 5 number summary (Minumum, Quartile 1, Median,
Quartile 3, and Maximum)
 Shows the spread of the data.

6. TYPE OF DATA
Categorical Data – data that describes characteristics –
described by words
Examples: eye color, educational level, gender.
Represented by Pie charts and bar graphs
Numerical Data – data that is measureable – described by
numbers.
Examples: height, number of people that attended the
carnival this month.
Represented by dot plots, stem and leaf plots, histograms
and box plots.

7. WHY USE GRAPHICAL DISPLAYS?
Graphical displays are used often to compare
data from similar situations. .
 A good example : when you own a business it is
always good to compare graphs from previous years
in order to predict business for the current year. I
worked in a restaurant when I was in high school and
college, and we would always use this method when
the season slowed down to see how many servers and
cooks we needed during the off-season.