Title: GRAPHS! GRAPHS! GRAPHS!
1GRAPHS! GRAPHS! GRAPHS!
- 8TH Grade Science
- Schindewolf Intermediate School
2What 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.
3Types 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
4Circle 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?
5When 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?
6Bar 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.
7When 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?
8Bar 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!
9Line 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.
10When 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?
11HA
HA
HA
12Variables
- 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
13Questions
- 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?
14Questions
- 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?
15Questions
- 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?
16The 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!
17Please 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
18Please 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