1. Measurement and Graphing

2. Objectives I can… Describe each type of graph
State the necessary elements of a graph
Determine which graph is best to use for a given set of data

3. Types of Graphs
Line Graph
Bar Graph
Pie Chart
Scatter Plot

4. Types of Graphs In general, graphs should have… Title Labeled axis
With units values are measured in if needed.
The independent variable in the X-axis, depnadant viable on the y-axis
Values at regular intervals along the axis
A range that is appropriate

5. Types of Graphs Who’s Best at Thumb Wrestling?
Identify the problems with this graph

6. Types of Graphs

7. Line Graph Compares two variables
Slope of line indicates relationship between variables
Good at showing specific values of data
meaning that given one variable the other can easily be determined
Show trends in data clearly
meaning that they visibly show how one variable is affected by the other as it increases or decreases
Enable the viewer to make predictions about the results of data not yet recorded

8. Line Graph

9. Bar Graph Compares Groups of Data Used with data obtained by counting
One axis has no value, other than ordering groups

10. Bar Graph

11. Pie Chart Pie charts display percentages
It is important to be aware of how pie charts can be misrepresented. There are two ways that this can happen:
Leaving out one or more of the parts of the whole.
Not defining what the whole stands for

12. Pie Chart

13. Scatter Plot Show how much one variable is affected by another.
The relationship between two variables is called their correlation
Positive / negative correlations exist
Usually consist of a large body of data

14. Scatter Plot

15. Graphing
You must be able to look at your data and determine the type of graph you will need.
Practice this on the next two slides.

16. Graphing Trial A B C D E F G T (oC) 20 30 40 50 60 70 80 P (atm) 1 1.5
2.5 3
3.5 4
How would we graphically analyze this data?

17. Graphing Mineral Hardness Copper 2.5 Galena Gold 3 Hematite 6.5
How would we graph this data?
Mineral
Hardness
Copper
2.5
Galena
Gold 3
Hematite
6.5
Magnetite 6

18. Assessment Can I… Describe each type of graph
State the necessary elements of a graph
Determine which graph is best to use for a given set of data