Graphing.

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Presentation transcript:

Graphing

Types of Graphs We use different types of graphs for different purposes Pie charts are used to show percentages Bar graphs are used to compare changes over time or to compare items Line graphs are used to look for trends in the change in the dependent variable as the independent is changed

Line Graphs The independent variable (the one being changed) is the x-axis and the dependent variable is the y-axis Label each axis with its value and type of measurement Your graph should have each axis start at zero, but you can use a symbol to show that you are skipping values

Line Graphs (cont) You can divide the range of values by the number of boxes to help you pick a scale Place a dot where the values for both the x-axis and y-axis meet Connect the dots with a line

Line Graphs (cont) Graph the following data points Elevation (m) Temperature (°C) 100 19.5 200 18.7 300 18 400 17.5 500 16.8 600 16 Graph the following data points The independent variable is elevation and the temperature is the dependent variable

Interpreting Line Graphs If a slope is close to being linear (straight line) there is a direct relationship between the variables. If the line goes up from left to right it means as the independent variable increases the dependent variable increases with it If the line sinks as it goes to the right it means as the independent variable increases the dependent variable decreases

Interpreting Line Graphs (cont) Proportional (increase together) Inversely proportional (independent increases, but the dependent decreases)

Interpreting Line Graphs (cont) Time (hours) Distance (Km) 1 10 2 20 3 30 4 40 Graph the following data points The independent variable is time and the distance is the dependent variable What is the relationship between time and distance? Proportional

Interpreting Line Graphs (cont) Time (sec) Position (m) 60 2 50 4 40 6 30 8 20 10 Graph the following data points The dependent variable is position and the time is the independent variable What is the relationship between position and distance? Inversely proportional