1. Graphing

2. Graphing
Two students work together to complete a study to determine how the amount of water given to plants affects the plant growth. Each student is then responsible for creating a graph to demonstrate the relationship between the variables.
Compare the two graphs given below:
110
125

3. Graphing
110
125

4. Graphing
Graphs are drawn so that we can easily see relationships between variables.
As previously demonstrated, there are certain properties that a graph should possess in order to best show these relationships. It is these traits that will be assessed when you create graphs for this class.

5. Graphing
The title of the graph clearly relates to the information displayed on the graph.
The title should be in the form of responding variable vs. manipulated variable
The title should be clearly displayed at the top of the graph.

6. Graphing
Lab Scenario: An experiment was done to see if salt affects the boiling point of water. 100 mL of water was mixed with a different amount of salt for each trial. The water was then heated until boiling. The temperature that the water boiled at was recorded in degrees Celsius.
Write a title for the graph that would be plotted for the experiment.
Boiling point of water versus amount of salt added

7. Graphing
The independent (manipulated) variable is placed on the x-axis and the dependent (responding) variable is placed on the y-axis.
On a graph, the horizontal axis is the x-axis
The vertical axis is the y-axis.

8. Graphing
Lab Scenario: An experiment was done to see if salt affects the boiling point of water. 100 mL of water was mixed with a different amount of salt for each trial. The water was then heated until boiling. The temperature that the water boiled at was recorded in degrees Celsius.
Which variable would go on the x-axis?
Amount of salt added
Which variable would go on the y-axis?
Boiling Point

9. Graphing
3.The data was used to choose an appropriate consistent interval to number the x-axis and y-axis.
You must determine how to number the axes with numbers called increments.
The increments on the axes do not have to start at zero
The increments on the x-axis do not have to be equal to the increments on the y-axis

10. Graphing
Use the data given and the number of blocks on your graph paper to determine the increments you will use.
Increment Practice Worksheet

11. Graph 1 Graph 1 Mass vs. Volume Volume(mL) Mass(g) 25.0 35.0 30.0 42.0

12. Graph 2 Sun exposure (hr) Height(mm) 1.0 1 2.0 8 3.0 27 4.0 64 5.0 125
Graph 2 Plant Height vs. Sun exposure
Sun exposure (hr) Height(mm)

13. Graph 3 Age (years) Distance Walked (km) 20 20 30 15 40 12 50 8 60 5
Graph 3 Distance Walked vs. Age
Age (years) Distance Walked (km)

14. Graphing
Use the data given and the number of blocks on your graph paper to determine the increments you will use.
Boiling Point as a function of amount of salt added for 100 mL of water
Salt Added (g) Boiling Point (oC)

15. Graphing
4. Numbers on each graph axis are spaced evenly.

16. Graphing
When labeling numbers on the axes, do not list your data values, rather list regular increments.
Boiling Point as a function of amount of salt added for 100 mL of water
Salt Added (g) Boiling Point (oC)

17. Graphing
5. All parts of the graph are labeled (each axis, including units).

18. Graphing
6. The set of data is plotted on the graph completely and accurately.

19. Graphing
Once the points have been plotted, it is often useful to connect each value with a best fit line.

20. Graphing
These should not connect the dots, but instead show the general relationship between the plotted variables.

21. Graphing DIRECT linear relationship As X increases, Y increases
Possible Relationships
DIRECT linear relationship
As X increases,
Y increases

22. Graphing INVERSE linear relationship As X increases, Y decreases
Possible Relationships
INVERSE linear relationship
As X increases,
Y decreases

23. Graphing
Possible Relationships
Curvilinear relationship

24. Graphing
After graphing your data, write a caption for the graph that includes the type of relationship and a conclusion.