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Graphing In Science

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A line graph is used to show change over time. It's clear to see how things are going by the rises and falls a line graph shows. ... – PowerPoint PPT presentation

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Title: Graphing In Science


1
Graphing In Science
2
Graphing
  • Graphs are a useful tool in science.
  • The visual characteristics of a graph make trends
    in data easy to see.
  • One of the most valuable uses for graphs is to
    show data collected during an experiment. The
    graph shows your results.

3
Why Do We Use Graphs?
  • Graphs help us visualize numerical data.
  • There are 3 different types of graphs
  • Bar graphs
  • Pie graphs
  • Line graphs

4
The cafeteria wanted to collect data on how much
milk was sold in 1 week. The table below shows
the results. We are going to take this data and
display it in 3 different types of graphs.
5
Bar Graph
  • A bar graph is used to show relationships between
    groups.
  • The two items being compared do not need to
    affect each other.
  • It's a fast way to show big differences. Notice
    how easy it is to read a bar graph.

6
Circle Graph or Pie Graph
  • A circle graph is used to show how a part of
    something relates to the whole.
  • This kind of graph is needed to show percentages
    effectively.

7
Line Graph
  • A line graph is used to show change over time.
  • It's clear to see how things are going by the
    rises and falls a line graph shows.

8
Bar Graph
The same data displayed in 3 different types of
graphs.
Circle (Pie) Graph
Line Graph
9
On what day did they sell the most chocolate milk?
a. Tuesday b. Friday c. Wednesday
10
On what day was the least amount of chocolate
milk sold?
a. Monday b. Tuesday c. Thursday
11
On what day did they have a drop in chocolate
milk sales?
a. Thursday b. Tuesday c. Monday
12
OOPS! Wrong Answer
Look for the tallest bar
Try Again
13
You are Correct
14
OOPS! Wrong Answer
Look for the smallest slice
Try Again
15
You are Correct
16
OOPS! Wrong Answer
Look for the drop on the line
Try Again
17
Choosing the Right Graph
  • Use a bar graph if you are not looking for trends
    (or patterns) over time and the items (or
    categories) are not parts of a whole.
  • Use a pie chart if you need to compare different
    parts of a whole, there is no time involved and
    there are not too many items (or categories).
  • Use a line graph if you need to see how a
    quantity has changed over time.  Line graphs
    enable us to find trends (or patterns) over time.

18
Graphing Steps
  • Identify the Variables
  • Number and label each axis
  • Plot the points
  • Draw the graph
  • Give your graph a title

19
Identify the Variables
  • Independent Variable - (the thing you changed)
  • Goes on the X axis (horizontal)
  • Should be on the left side of a data table.
  • Dependent Variable - (changes with the
    independent variable)
  • Goes on the Y axis (vertical)
  • Should be on the right side of a data table.

20
Label Axis's
  • You need to tell everyone reading your graph what
    the graph means.
  • Be sure to include units.

21
Title
  • Your title should clearly tell what the graph is
    about.
  • If your graph has more than one set of data,
    provide a "key" to identify the different lines

22
References
  • Dorris Spencer
  • www.whsd.net/courses/J0077/Unit_01_-_Statistics_an
    d_Data/Bar20Circle20and20Line20Graph20PowerPo
    int.ppt259,1,Different Types of Graphs
  • http//www.cobb.k12.ga.us/dickerson/sci20method.
    ppt256,1,Scientific Method
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