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**Reading, Constructing, and Analyzing Graphs**

GRAPHING Reading, Constructing, and Analyzing Graphs

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**Make sure your graph “TALKS” to me!!**

T-Title A-Axis (x axis=independent variable y axis=dependent variable) L-Label (everything should be labeled) K-Key (if appropriate) S-scale (make sure scale of numbers is appropriate-don’t always have to use increments of 1)

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Bar Graphs *easily read, used to graph categories of things, usually have spaces between the bars **What is this bar graph missing?

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Histograms *similar to bar graphs except the bars represent a range of values rather than one single value and the bars touch each other *intervals should be equal (1-10, 10-20, etc.) *width of bars should all be the same

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Line Graphs *shows change over time or relationship between 2 quantities *do NOT connect dots after plotting points Draw a “Line of Best Fit” or a “Curve of Best Fit” -Use the points to draw the best straight line you can; have the line pass through as many points as possible, with approximately the same number of points on one side of the line as the other

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Analyzing Graphs Interpolation—finding a value that is actually on the graph Extrapolation-finding a value that lies BEYOND the actual data on the graph

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BAR GRAPH PRACTICE Use the following data to create a bar graph. REMEMBER: Make sure your graph “TALKS” to me!! “Plant Growth: Height Vs Time” Time (days) Height (cm)

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Bar Graph Questions Interpolation: What is the independent variable for this graph? How tall was the plant after 10 days? Extrapolation: How tall do you think the plant will be after day 40? Explain.

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Histogram Practice Use the data to create a histogram. REMEMBER: Make sure your graph “TALKS” to me! DATA ON THE NEXT SLIDE!

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**Life Expectancies in the US**

Current Age Remaining Years Expected

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Histogram Questions Interpolation: Mrs. Parker is 38 years old. About how many more years can she expect to live according to the graph? Extrapolation: Make a prediction about the remaining years of life that would be expected for someone in the current age category of Justify your answer. (Give specific information!)

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Line Graph Practice Use the data on the next slide to create a line graph. Remember: Make sure your graph “TALKS” to me! Do NOT connect the points after plotting them; Draw a “Line of Best Fit” or a “Curve of Best Fit”

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**Time Vs Position of a Miniature Motorized Car on a Straight Track**

Time (minutes) Position (meters)

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Line Graph Questions Interpolation: What is the independent variable for this graph? What is the dependent variable for this graph? Determine the position of the car after 2.5 minutes. Extrapolation: If the experiment was conducted for 35 minutes, what would be the position of the car? How many minutes will it take the car to reach the position of 180 meters?

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Scientific Graphs Most of the time, scientists use line graphs instead of the bar graphs; therefore, we will be using line graphs in science. You are too young for bars, anyway!!!

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FIST OR FIVE?? Show me a fist if there is something we have covered about graphs that you still don’t understand. Give me a five if you are comfortable with bar graphs, histograms, and line graphs.

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