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Part 1.  Graphs are used to illustrate what happens during an experiment.  Bar graph - used for comparing data.  Pie graph - used to show percentages.

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Presentation on theme: "Part 1.  Graphs are used to illustrate what happens during an experiment.  Bar graph - used for comparing data.  Pie graph - used to show percentages."— Presentation transcript:

1 Part 1

2  Graphs are used to illustrate what happens during an experiment.  Bar graph - used for comparing data.  Pie graph - used to show percentages.  Line graph - used to show continuous change, usually change over time.

3  A data table has 2 columns (not always).  The first column is the independent variable.  The second column is the dependent variable. INDEPENDENT VARIABLE DEPENDENT VARIABLE

4  This is the factor that we can change.  Example: How long the thermometer is in the water, or how far the runner races.

5  These are the results we get.  Example: The water temperature, or how fast the runner ran.

6  Controlled parameters are the factors that stay constant during the experiment.  Example: The amount of salt used or the material used.  Variable Parameters are factors that change during the experiment.  Example: The mass or volume of the gummy bear in water.

7  Data tables help you organize data.  Graphs help you understand and use data.

8  An axis is a line that forms one side of the graph.  X-axis: the horizontal line that represents the independent variable.  Y-axis: the vertical line that represents the dependent variable.

9  To find the range of each axis, subtract the smallest value on the data table from the largest value.  Scale: Each axis has its own scale, or how many spaces between numbers.

10  You plot the data points by putting a dot on the graph for each pair of data on the data table.

11  Title: The title tells people what the graph describes. Do NOT use the word graph in your title.  Label axes: Also label the x-axis and y-axis. Include the name and unit label if necessary, like “distance (m)” or “time (sec.)”.

12  ALWAYS USE A RULER!  ALWAYS MAKE AS LARGE AS POSSIBLE!  1) Draw the x and y axes.  2) Label the axes. Include units if needed. 1st column of data table = x-axis 2nd column of data table = y-axis  3) Decide - line graph or bar graph?  4) Choose a scale and fill in numbers.  5) Plot your data.  6) Write a title for your graph.

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15  T Title  L Labels  U Units  D Data

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