1. Graphing Scientific Data

2. 3 Types of graphs
Bar - graph counted data, using bars to indicate number of responses per item. (Can be flipped horizontally or vertically)
Activity
Number
Visit w/ friends
175
Talk on phone
168
Play sports
120
Earn money
Use computers 65

3. Line- graph changes in data; change in temperature over time, by plotting points on graph and connecting points.
Temperatures in NY City
Day Temperature 1
43 F 2
53 F 3
50 F 4
57 F 5
59 F 6
67 F

4. Pie- graph percentage data, using a circle divided like pie pieces.

5. What do all graphs have?
Title- Describes what the graph is about, what the graph is telling you.
Axis labels- define the data graphed; time, number, temperature etc..
Uniform tic marks-graphs must be uniformly incremented; every square = 5 or 50.
Graphs do NOT have to start at point 0,0 unless that is a data point.

6. Descriptive TITLE
Note: this graph does not start at 0,0 but starts at (1,0) as the first data is day 1, temp 43.
Could have started graph at
(1, 40) as per data range!
Grids are uniformly incremented
Axes Labels

7. Graph Lab
Purpose: To practice graphing class data and Roseville data using appropriate graphical methods
Data and Graphs: (All data tables and graphs from following slides will go here.)

8. AGE
# students
% students 13 14 15 16 17 18 19
Total:
To get percent: Divide the number of students by the total number of students in class. Ex: 8/30=0.2666= 26%

10. How to graph on a line graph
First decide where the information will be graphed.
Choose the scale so the graph becomes large enough to fill most of the available space on the paper. (You do not want the graph to be miniature and unreadable)
Each regularly spaced division on the graph paper should equal some convenient, constant value.
Label each axis with the quantity and unit being graphed.

11. How to graph, con’t
Plot each point. If you plot more than one curve on the same graph, use a different color or geometric shape to distinguish each set of data.
Connect the points as directed.
Title your graph with an informative title.

12. How to determine where to put what on a line graph
The horizontal axis (x-axis) is used for the quantity that can be controlled or adjusted. This is called the independent variable.
The vertical axis (y-axis) is used for the quantity that responds to the changes in the quantity on the x-axis. This is called the dependent variable.

13. y-axis
Dependent variable
(include units
x-axis Independent variable (include units)

14. Roseville Average Temperatures and Rainfall 2008
Month
Avg. Temp in degrees F
Avg. Rainfall in inches
January 54
4.5
February 61
4.3
March 65
April 72
1.8
May 80
0.5
June 89
0.3
July 95
0.1
August 94
September
October 79
1.3
November 64
3.5
December 55
3.4

16. Conclusions: (use complete sentences, and you will have a total of one paragraph that answers all of the questions in it!)
Which type of graph is used to chart changes in something (like change in temperature over time?)
Which type of graph is used to chart counted data?
Which type of graph is used to chart percentage data?
What are the things all graphs need?
How does today's learning connect to what you already knew?
How did it extend your thinking further?
What questions do you still have about today’s material?

17. Example paragraph:
A line graph is used to chart changes in information like temperature over time. A bar graph is used to show counted data. A pie graph is used to chart percentages. The dependent variable changes in response to the independent variable….