2. Showing patterns & trends Graphing Your Data A picture is worth a thousand words!

3. Variables Dependent variable measured variable unpredictable change: we don’t know how it will change until we do the experiment Y-axis Independent variable manipulated variable The thing I change predictable change: it only changes because we chose how it would change X-axis 2005-2006 Types of data (information) The effect of _____________ on _____________ Independent Dependent

4. D – Dependent variable R - Responding variable Y – Y - axis M – Manipulated variable I – Independent variable X- X-axis DRY MIX 2005-2006

5. How does fertilizer affect the growth rate of plants? we set up an experiment testing different amounts of fertilizer on different plants & measuring the growth (height) of the plants: dependent variable (Y-axis)? height of plants independent variable (X-axis)? amount of fertilizer 2005-2006 Examples of experiments 1 The effect of _____________ on _____________ Amount of Fertilizer Height of Plants

6. How does exercise affect heart rate of 10th grade student? we set up an experiment testing different lengths of time of exercise (minutes) on the heart rate of students: dependent variable (Y-axis)? heart rate independent variable (X-axis)? minutes of exercise 2005-2006 Examples of experiments 2 The effect of _____________ on _____________ Exercise Heart Rate

7. What’s the favorite drink of students? we set up an experiment surveying students and asking which is their favorite drink : dependent variable (Y-axis)? number of students independent variable (X-axis)? type of drink 2005-2006 Examples of experiments 3 The effect of _____________ on _____________ Type of Drink How Many Students Choose It

8. Graphs line graphs graphing data that shows continuous change bar graphs (or histograms) graphing data that is in disconnected groups 2005-2006 Making pictures out of data How’s a critter to choose?

9. 2005-2006 How does elevation affect temperature? Elevation Temperature (°C) 5 10 15 20 25 30 050010001500 2000 2500 0 ElevationTemperature (°C) 030 50025 100020 150015 200010 25005 1200 ft? 1818 Line graph! 1200

10. 2005-2006 Which drink do you like best? type of drink Number of Students 1 2 3 4 5 6 Coke Pepsi waterteaGatorade 0 Type of Drink Number of Students Coke1 Pepsi1 Water4 Iced tea4 Gatorade3 Which do students like the best? Bar graph!

11. Pie/Circle graphs = Parts of a whole (out of 100%) What percent of student athletes participate in these sports? 2005-2006

12. Another example of a Pie Graph 2005-2006

13. Line graph – continuous change Bar Graph – compare different groups Pie/circle graph – parts of a whole Know which type of graph is best for each situation. 2005-2006