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

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 Types of data (information) The effect of _____________ on _____________ Independent Dependent

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

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 Examples of experiments 1 The effect of _____________ on _____________ Amount of Fertilizer Height of Plants

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 Examples of experiments 2 The effect of _____________ on _____________ Exercise Heart Rate

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 Examples of experiments 3 The effect of _____________ on _____________ Type of Drink How Many Students Choose It

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

How does elevation affect temperature? Elevation Temperature (°C) ElevationTemperature (°C) ft? 1818 Line graph! 1200

Which drink do you like best? type of drink Number of Students Coke Pepsi waterteaGatorade 0 Type of Drink Number of Students Coke1 Pepsi1 Water4 Iced tea4 Gatorade3 Which do students like the best? Bar graph!

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

Another example of a Pie Graph

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