2. Regents Biology Graphing Your Data Showing patterns & trends Follow me for Hints!

3. Regents Biology 2005-2006 Types of data (information)  Variables  what you measure in an experiment  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  predictable change: it only changes because we chose how it would change  X-axis The effect of _____________ on _____________ INDEPENDENT DEPENDENT

4. Regents Biology Examples of experiments 1  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 The effect of _____________ on _____________ Amount of Fertilizer Height of Plants

5. Regents Biology Examples of experiments 2  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 The effect of _____________ on _____________ Exercise Heart Rate

6. Regents Biology Examples of experiments 3  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 The effect of _____________ on _____________ Type of Drink How many students chose it

7. Regents Biology Making pictures out of data  Graphs  line graphs  graphing data that shows continuous change  bar graphs (or histograms)  graphing data that is in disconnected groups  pie charts  use when comparing percentages or amounts What graph type do I choose?

8. Regents Biology How does elevation affect temperature? elevation temperature 5 10 15 20 25 30 05001000150020002500 0 elevation (feet above sea level) temp. (°C) 030 50025 100020 150015 200010 25005 1200 ft? Label Axis! 1818 Line graph! 1200

9. Regents Biology Which drink do you like best? elevation temperature 1 2 3 4 5 6 CokePepsiwaterteaGatorade 0 drinknumber Coke1 Pepsi1 Water4 Iced tea4 Gatorade3 Red Bull? Make a good Key! RB Bar graph!

10. Regents Biology Rules to Follow for Graphing  Must have a title that corresponds to variables  Label the x and y axis with variables  Choose a scale for each axis (numbers that make sense!)  Make a good key

11. Regents Biology Any Questions??