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Published byLorin Watson Modified over 9 years ago

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Graphing in Science

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Types of Charts Most scientific graphs are made as line graphs. However, occasionally bar graphs, pie charts, or scatter plots are used.

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Why do we use graphs? All types of graphs and charts make trends in data easier to see. It is a way for scientists to analyze their data. It can also be used to predict data that is not measured on the graph.

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Steps to constructing a line graph Identify your variables Independent variable goes on the x-axis Dependent variable goes on the y-axis Determine the variable range Subtract the lowest data value from the highest data value for each variable Determine the scale of the graph This is the numerical value for each square that best fits the range of each variable Use most of the graphing space available.

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Steps to constructing a line graph (continued) Number and Label each axis Do not forget to include units!! Plot the data points. Draw the graph Connect the dots Best Fit Title the graph Titles should clearly show what the graph is about If you have more than one set of data, you need to include a key to identify the different lines

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Example Using the data table, answer the questions below: What is the independent variable? pH of the water What is the dependent variable? Number of tadpoles What goes on the x-axis? What is the range? pH of water (2.5) What goes on the y-axis? What is the range? Number of tadpoles (65) pH of water# of tadpoles 8.045 7.569 7.078 6.588 6.043 5.523

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Example pH of water# of tadpoles 8.045 7.569 7.078 6.588 6.043 5.523

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