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# Graphs

Overview of 10 different graphs we have used on class
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on 9 September 2012

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#### Transcript of Graphs

GRAPHS!! BAR GRAPHS What is a Bar Graph? A bar graph is a visual display used to compare the amounts or frequency of occurrence of different characteristics of data. This type of display allows us to:
compare groups of data, and
to make generalizations about the data quickly. Step by step guide Steps for Constructing a Bar Graph
Below are the steps to following when constructing a bar graph:

Determine the following of the bar graph from the table
Title of the graph.
Label for each axis--Here we must determine which is to be the frequency axis and which is to be the grouped data axis.
Scale for each axis--Determine the numerical scale for the frequency axis, then the group names for grouped data axis.
Draw a set of axes that you will use to construct your graph
Determine which axis will be the frequency axis--Determine whether bars will go horizontally or vertically.
Write in axes labels.
For the frequency axis, determine the scale interval.
Use the data from the table to draw in the bars on the graph. Why do we use a BAR graph? A bar graph is a way to visually represent qualitative data. Qualitative or categorical data occurs when the information concerns a trait or attribute and is not numerical.
This kind of graph emphasizes the relative sizes of each of the categories being measured by using vertical or horizontal bars.
Each trait corresponds to a different bar. The arrangement of the bars is by frequency.
By looking at all of the bars, it is easy to tell at a glance which categories in a set of data dominate the others.
The larger a category, the bigger that its bar will be. VIDEO EXAMPLE HISTOGRAM LINE GRAPHS What is a HISTOGRAM? Why do we use a HISTOGRAM? Step by step guide VIDE0 EXAMPLE STEM AND LEAF WHAT IS A BOX AND WHISKER? BOX AND WHISKER WHAT IS A DOT PLOT? DOT PLOT WHAT IS A PIE GRAPH? PIE GRAPH WHAT IS A STRIP GRAPH? STRIP GRAPH WHY DO WE USE A SCATTER PLOT? SCATTER PLOT WHAT IS A PICTOGRAM? PICTOGRAM WHY DO WE USE A PICTOGRAM? STEP BY STEP GUIDE VIDEO EXAMPLE WHY DO WE USE A PIE GRAPH? STEP BY STEP GUIDE VIDEO EXAMPLE WHY DO WE USE A STRIP GRAPH? VIDEO EXAMPLE STEP BY STEP GUIDE WHAT IS A LINE GRAPH? WHY DO WE USE A LINE GRAPH? VIDEO EXAMPLE STEP BY STEP GUIDE WHAT IS A SCATTER PLOT? VIDEO EXAMPLE STEP BY STEP GUIDE WHY DO WE USE A DOT PLOT? VIDEO EXAMPLE STEP BY STEP GUIDE WHY DO WE USE BOX AND WHISKER? VIDEO EXAMPLE STEP BY STEP GUIDE WHAT IS A STEM AND LEAF? WHY DO WE USE STEM AND LEAF? VIDEO EXAMPLE STEP BY STEP GUIDE your graph must have a TITLE! THINGS YOUR GRAPH MUST HAVE!! your graph must have the AXIS labeled correctly! your graph must have correct INTERVALS! titles tell us what the graphs are about axis tell us what variables we are comparing Intervals need to be consistent...going up the same amount each time! A histogram is a type of graph that has wide applications in statistics. Histograms allow a visual interpretation of numerical data by indicating the number of data points that lie within a range of values, called a class or a bin. The frequency of the data that falls in each class is depicted by the use of a bar. A histogram is used to graph grouped data from a frequency table; mainly where the data has been organised in intervals and especially for a numeric continuous data such as weights and lengths.

A histogram is often described as a bar graph with the bars joined together and is often called a bar graph by mistake!

Difference between bar graph and histograms
http://www.worsleyschool.net/science/files/bargraphs/page.html Organize your data into a table.
Create one column for data range categories, divided into equal intervals that will include all of your data (for example, 0-10, 11-20, 21-30), and another column for frequency or percentage.
Create a graph on graph paper.
Mark the data range intervals on the x-axis (horizontal axis) with no space between the categories.
Mark frequency or percentages on the y-axis (vertical axis), also in equal intervals.