1. Warm up 9/17 What are the metric prefixes which we remember with king Henry Died by drinking Chocolate Milk What percentage of the world’s countries use metric? When is the first Exam? – When is the Study Guide Due?

2. Notes: Graphing

3. Setting Up a Graph X axis- Independent Variable – This is the variable you controlled or manipulated. Y axis- Dependent Variable – This is the variable measured or observed during an experiment

4. Graphing Rules

5. Rule #1 Use a Pencil!

6. Rule #2 Always draw neat lines with a ruler or straight edge.

7. Rule #3 Label the X-axis (independent variable) and y-axis (dependent variable) And include UNITS! Example : If your X-axis is labeled “TIME,” you must put the unit in parentheses (hours, days, years, etc.)

8. Rule #4 Use an appropriate scale for each axis Graph must take up at least 75% of given space Graphs do not have to start at zero if your data does not include zero.

9. Rule #5 Title your graph

10. Rule #6 Provide a key (color or pattern) when using the same graph for multiple independent variables.

11. Best Fit Line If the points form a straight line….. draw the best straight line through them.

12. Best Fit Line The best fit line is the straight line that is closest to all points. – If you measured the distance from the line to all points and added the distance together, this is line which has the smallest sum. If a point is not on the line ….. Re-test this measurement again if applicable. x x x x x x This is called an anomalous point or outlier. You can decide to ignore anomalous points.

13. Curved Graphs If the points form a curve…. Draw a free hand curve of best fit. J-Curve: Usually shows slow then rapid growth of a population

14. Curved Graphs If the points form a curve…. Draw a free hand curve of best fit. S-Curve: Shows slow then rapid growth until the population stabilizes