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.
