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# Graphing

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Graphing

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### Graphing

1. 1. Communicating With Graphs<br />Graph -- a visual display of information or data, used by scientists to better visualize patterns in data. Three basic types include line graphs, bar graphs, and circle graphs<br />
2. 2. Line Graphs<br />A line graph can show any relationship where the dependent variable changes due to a change in the independent variable<br />The horizontal or x-axis is always used for the independent variable.<br />The vertical or y-axis is always used for the dependent variable.<br />
3. 3. Line Graphs<br />
4. 4. Bar Graphs<br />A bar graph is useful for comparing information collected by counting.<br />As on a line graph, the independent variable is shown on the x-axis and the dependent variable on the y-axis.<br />
5. 5. Circle Graphs<br />A circle graph or pie graph is used to show how some fixed quantity is broken down into parts. The circular pie represents the total. The slices represent the parts and are usually represented as percentages of the total. The angle of each pie slice is determined by multiplying its fraction or percent times 360 degrees in a circle and measuring the angle with a protractor. If a pie slice represents 1/4 or 25% of the whole pie, then multiply either 1/4 x 360  or .25 x 360 and you get 90 degrees.<br />
6. 6. Lab Safety<br />Always follow teacher’s directions as reviewed before each lab. <br />Know location of safety equipment in room such as fire extinguisher, fire blanket, eyewash station, shower, first aid kit, etc. <br />Wear safety goggles and aprons when using chemicals or flame. <br />Review rules on safety posters in room and back of your book. <br />