Illustrating Data in Graphs

Graphing data is the first and often most important step in data analysis. So now that we have our data set up in frequency tables, we can move forward to illustrating this data in graphs. First, let's understand the graph axis then proceed to the common types of graphs.

 

Each graph is made up of the Abscissa and the Ordinate:

abscissa - the horizontal axis of a graph (X)

ordinate - the vertical axis of a graph (Y)

  http://www.business-analysis-made-easy.com/image-files/xy-axis.gif

 

Primary Types of Graphs:

 

1. Frequency Polygon

 

http://media.wiley.com/Lux/73/25673.nfg009.jpg

 

2. Histogram

 

http://www.cyber-wit.com/images/gallery/histogram1_b.png

 

3. Bar Graph

 

http://illuminations.nctm.org/Lessons/ConnectingCubes/SampleBarGraph.jpg

4. Scatterplot

 

http://allpsych.com/researchmethods/images/scatterplot.gif

 

 


PRACTICE PROBLEM 1.2:

Use the data from practice problem #1 to create:

A. A bar graph

B. A frequency polygon

 

4, 7, 7, 7, 8, 8, 7, 8, 9, 4, 7, 3, 6, 9, 10, 5, 7, 10, 6, 8, 7, 8, 7, 8, 7, 4, 5, 10, 10, 9, 8, 3, 7, 9, 7, 9, 5, 8, 5, 4, 6, 6, 7, 5, 3, 2, 8, 5, 10, 9, 10, 6, 4, 8, 8, 8, 4

 

 

ANSWER 1.2A (Mouse-Over to Check Your Answer).

 

ANSWER 1.2B (Mouse-Over to Check Your Answer).