Line graphs are best for displaying continuous changes in a dependent variable in response to an independent variable. They show the relationship between two variables, with the dependent variable plotted on the y-axis and independent variable on the x-axis. Other common graphs include bar graphs, which display data collected by counting, and pie charts, which show the distribution of parts within a whole quantity. Organizing and presenting data through written reports and oral presentations are important science skills that allow scientists to share their results.

1. Types of GraphsTypes of Graphs
(I would take some notes(I would take some notes
on this!)on this!)

2. • Line graphs – data that
change
– Independent variable – one you
set (x-axis)
– Dependent variable – changes in
response to independent (y-
axis), one you measure

3. Presenting Scientific DataPresenting Scientific Data
• Line graphs are best for continuous change.
– dependent variable: values depend on what
happens in the experiment
• Plotted on the x-axis
– independent variable: values are set before the
experiment takes place
• Plotted on the y-axis

4. Line GraphLine Graph
• shows the
relationship
between 2
variables
– Dependant
– Independent
DependentVariable
Independent Variable

5. Line GraphLine Graph

6. Other types of graphsOther types of graphs
• Bar graphs – compare data
for several items/events
• Pie charts – display data that
are parts of a whole

7. Bar GraphBar Graph
• shows
information
collected by
counting

8. Bar GraphBar Graph

9. Pie GraphPie Graph
• shows
distribution
of parts
within a
whole
quantity
– Rarely used
for science
labs!

10. Presenting Scientific Data,Presenting Scientific Data,
continuedcontinued
• Pie graphs show the parts
of a whole.
– A pie graph is ideal for
displaying data that are
parts of a whole.
– Data in a pie chart is
presented as a percent.
Composition of a Winter Jacket

11. Presenting Scientific Data,Presenting Scientific Data,
continuedcontinued
〉Why is organizing data an important
science skill?
〉Because scientists use written reports and
oral presentations to share their results,
organizing and presenting data are
important science skills.

12. BellringerBellringer
Imagine your teacher asked you to study
how the addition of different amounts of
fertilizer affect plant heights. In your
experiment, you collect the data shown in
the table below. Use this data to answer the
following questions.

13. Bellringer,Bellringer, continuedcontinued
1. Which amount of fertilizer
produced the tallest plants?
2. Which amount of fertilizer
produced the smallest plants?
3. Plot the data on a grid like the
one below.

14. Affect of fertilizer on plant height
0
5
10
15
20
25
10 25 20 0 5 30 15 35
Amount of Fertilizer (g)
Heightofplantincm

15. Affect of Fertilizer on Plant height
0
5
10
15
20
25
0 5 10 15 20 25 30 35
Amount of fertilizer (grams)
HeightofPlant
(centimeters)

16. Key IdeasKey Ideas
〉Why is organizing data an
important science skill?
〉How do scientists handle very
large and very small numbers?
〉How can you tell the precision
of a measurement?