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Data TablesData Tables Organize data. Neat rows and columns. A place to record data. Communicate to others. Show relationships. Each data item represents the relationship between the row value and column value.

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The Population Data TablesData Tables For Example : Population of the United States YearPopulation (in millions) 190076 191092 1920105.7 1930122.8 1940131.7 1950151.3 1960179.2 1970203.2 1980226.5 1990251.4 Each data item is connected to a row label and a column label. Here the number 92 shows in 1910

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Graphs We will use three types of graphs Circle Graphs (Pie Charts) Bar Graphs Line Graphs

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Use a circle graph whenever the data is in percent. The entire circle represents 100%. Each section should be labeled: Name Number A circle graph should also have a title. Circle (Pie Chart) GraphsCircle (Pie Chart) Graphs Each section is sized according to the size of its data. You may also use letters or colors that refer to names in a key.

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We use a Bar graph whenever the data represents separate categories of data. The categories are listed along the horizontal axis. A measurement scale is constructed along the vertical axis. Bar GraphsBar Graphs A bar graph should have: a title a label for each axis a key if multiple sets of data are displayed. # of Students

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When you have one category of data that is changing. A measurement scale is constructed along the vertical axis and horizontal axis. Each scale should have equal spacing. (But NOT necessarily the same.) Line GraphsLine Graphs The graph should have: A title Labels on each axis A key if multiple sets of data are graphed.

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Important! The data values NEVER go on the horizontal or vertical axis. The smallest value on the axis should be a little less than, or equal to, the smallest data value. Line GraphsLine Graphs Create equal increments to mark the axis. The largest value should be greater than, or equal to, the largest data value.

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Independent and Dependent variables. When plotting data, The independent variable is measured along the horizontal axis. The dependent variable is measured along the vertical axis. Line GraphsLine Graphs

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Data points represent the intersection of a horizontal value and a vertical value. Line GraphsLine Graphs Do NOT connect the dots!

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Best Fit lines represent the general trend of the data. Use a ruler. Line GraphsLine Graphs Not from the smallest data point to the largest data point. Try to draw a line that keeps all of the points as close to the line as possible. Mark the trend of the data.

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Interpolation and Extrapolation Use the best fit line to make inferences about data points not measured. Line GraphsLine Graphs Interpolation: Making inferences about data values between the data points. We could interpolate that in the third year, the growth would be about 7m.

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Interpolation and Extrapolation Line GraphsLine Graphs Extrapolation: Making inferences about data values outside the range of the measured data. 12 30 25 Use the best fit line to make inferences about data points not measured. We could extrapolate that in the 12 th year, the growth would be about 28m.

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Slope has meaning! How do you calculate slope? Line GraphsLine Graphs Y/X Remember: means (final – Initial) On some graphs it is meaningless. But we must always check.

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Slope has meaning! How do you calculate slope? Line GraphsLine Graphs Y/X Remember: means (final – Initial) Mass (g) Volume (mL) On some graphs it is meaningless. But we must always check.

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Slope has meaning! How do you calculate slope? Line GraphsLine Graphs Y/X Remember: means (final – Initial) Meters (seconds) On some graphs it is meaningless. But we must always check.

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