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Graphs

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Types of graphs Line graphs Sector graphs Picture graphs Bar graphs Step graphs Column graphs DIFFERENT TYPES OF GRAPHS

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Type of graphForm of informationWhy they are used Column/bar graph Groups of things that have been measured or counted. Used to compare things. Line graph Two quantities that have been measured or counted. One is usually time. Used to show trends or changes over time. Pie graphPercentages or proportions of different things that make up a whole. Used to compare the relative sizes of things. The main types of graphs used in science are:

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Line graphs

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The y-axis and the x-axis

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Interpreting graphs: In order to interpret a graph there are a number of important parts that you must be able to identify and read. Most graphs will have a: Title. This gives you a short explanation of what the graph is about. Horizontal axis. This is a line running across the graph. It has a label beneath it. It may have a scale. Vertical axis. This is a line running up the side of a graph. It has a label next to it. It may have a scale. The scales. The scales on horizontal or vertical axes are similar to the scales found on many measuring instruments. A scale is a series of numbers that are increasing or decreasing by the same amount. Part of the skill of interpreting a graph is reading the scales on the axes. Each scale will be labelled with the unit of measurement that has been used. In addition some graphs will have a: Source. This tells you where the information has come from. Key. This explains any symbols used in the graph.

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Is often used to represent a set of data values in which a quantity varies with time Line graph Shows how one thing is affected by another. A line graph is used to show the relationship between two variables. A line graph has two lines or axes. One is the horizontal axis which goes from side to side. The other is the vertical axis which goes up and down. Summary

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Things you should follow when drawing a line graph use graph paper Plot the points accurately with a small dot or x. draw in the two axes with a ruler use a pencil

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Line graph Jump= 50 Spaces= 2 Each line =50/2= 25 Line graphs are useful for showing how things change over time. Mass depends on the temperature Temperature does not depend on mass Vertical axis Horizontal axis Jump= 20 Spaces= 2 Each line =20/2= 10

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This table shows the result of Dinas pulse rate after running in the Junior Quad, measured after each minute. Draw a graph for Dinas result. TimePulse rate(beats per minute) 070 178 297 3108 4102 587 Example

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Time (Minutes) Pulse rate (beats per minutes) Graph of pulse rate after exercise Step 1: draw the axes Step 2: identify the dependent and the independent variables. (Pulse rate depends on the time so time is the independent and goes on the horizontal axis) Step 3: draw the axes and label them Step 4: setting up the scales. The scale for each axis is different. On the horizontal axis its going up by 1. On the vertical axis its going up by 20) TimePulse rate(beats per minute) 070 178 297 3108 4102 587 Step 5: draw the line Step 6: add a title

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Step 1: Draw the axes Step 2: Pulse rate depends on the time so it goes on the horizontal axis.. Time goes on the vertical axis. Time (Minutes) Pulse rate (beats per minutes) Step 3: Label them Step 4: Setting up the scales. Count how may squares represent one. (same interval). The scale for each axis is different. On the horizontal axis its going up by 1. On the vertical axis its going up by 20) Step 5: Putting up the values and draw the line Step 6: Add a title 0 123 20 40 60 Graph of pulse rate after exercise Title Scale

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Evaluation and Feedback from each student

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