GRAPHS! GRAPHS! GRAPHS!

1
GRAPHS! GRAPHS! GRAPHS!

• 8TH Grade Science
• Schindewolf Intermediate School

2
What is a graph?

• Graphs are pictures of data.
• Graphs allow people to present and view data in a
  format that is easier to see and make
  interpretations.

3
Types of Graphs...

• There are several types of graphs but the three
  we are going to focus on today are

Circle Graphs
Bar Graphs
Line Graphs
4
Circle Graphs

• Circle graphs are graphs in the shape of a
  circle. They are sometimes called Pie Graphs or
  Pie charts.
• Often Circle Graphs are divided into different
  parts and each part is color coded.
• Consider this chart that shows how a college
  students money is spent
• Q?1 What takes the largest percentage of money?
• Q?2 Which category is taking 10 of the money?

5
When do I use a Circle graph?

• Any time you have percents ,
• Any time you are comparing things and you have
  ALL of the possible data.

Consider the chart to the right that shows a
class of 8th graders music preferences Q?3
What is the LEAST popular type of music? Q?How
many MORE students preferred Jazz to Rap?
6
Bar Graphs

• Bar Graphs are usually considered the easiest
  type of graph to read. They include solid lines
  or bars to represent different categories of
  data.
• Bar Graphs can be horizontal but are usually
  oriented vertical with categories across the
  bottom.

7
When do I use a Bar graph?

• Whenever you are comparing information that can
  be placed in different categories.
• Q?5 What correlation do you see between highest
  level of education and Unemployment?

8
Bar Graph vs. Circle Graph
How do you know when to use a Bar Graph vs. a
Circle graph? If you have ALL of the possible
information-you can use a circle. If you have
only some of the information you must use a bar
graph. For example, imagine you wanted to
compare favorite types of fruit. If you asked 10
kids in a class of 30, you would use a bar graph.
If you asked all 30, you could use a circle graph!
9
Line Graphs

• Line Graphs are a special kind of graphs where a
  single line compares two variables.
• Often line graphs can display two separate lines
  for two different categories of information.

10
When do I use a Line graph?

• Any time you are comparing a single type of
  variable with another variable.
• Any time you are showing change over time.
• Q? 6 What was Treys height in inches at 4 years
  of age?
• Q?7 How many inches did Trey grow from Birth to
  age 8?

11
HA
HA
HA
12
Variables

• Does it matter what goes where??
• YES!
• In line and bar graphs, the Dependent Variable
  ALWAYS goes on the Y axis. Remember DRY?
• The Independent Variable ALWAYS goes on the X
  axis. Remember MIX

Y
X
13
Questions

• 8. What type of graphs should you use if showing
  measurement over time? (See slide 9)
• 9. What axis does the Independent Variable belong
  on?

14
Questions

• 10. If you have data showing average attendance
  for 5 different schools in a district of 17
  schools, What kind of graph would you use?
• 11. If you have data showing average attendance
  for all 17 schools, what kind of graph would you
  use?
• 12. What type of graph would you use to show seed
  growth of time?

15
Questions

• 13. Which two types of graphs might you consider
  if you wanted to represent different categories
  of information?
• 14. What type of graph plots different points and
  connects them with a line?
• 15. Which axis does the Y variable go on?

16
The following slides will show you answers.

• Please check them carefully.
• Remember-we are giving you answers so you can
  check your own work and go back and review things
  you missed. This is your test coming up Friday
  and all of these questions mirror questions from
  the test!

17
Please Check your answers

• 1. Tuition and Fees
• 2. Board
• 3. Classical
• 4. 4
• 5. The higher the level of education, the lower
  the unemployment.
• 6. 45 inches

18
Please Check your answers

• 7. 35 inches
• 8. Line Graph
• 9. X
• 10. Bar Graph
• 11. Circle Graph
• 12. Line Graph
• 13. Bar or Circle
• 14. Line Graph
• 15. Y