Wolfram Language Fast Introduction for Math Students
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Data Plots & Best-Fit Curves

Use ListPlot to visualize data as a scatterplot:

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ListPlot[{1, 3, 4, 7, 9, 15}]
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Or display information as a chart:

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BarChart[{1, 2, 3, 4, 5}]
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There are also specialized functions for time series, financial data and much more.

Multiple datasets are automatically colored differently:

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ListLinePlot[{{1, 2, 3, 4, 5}, {1, 3, 7, 10, 17}}]
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You can change the style and appearance of plots using options like PlotTheme.

Find a curve of best fit with the Fit command:

({1,x,x2} means a quadratic fit over x.)
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Fit[{2, 3, 5, 7, 11, 13}, {1, x, x^2}, x]
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Use Show to compare the curve with its data points:

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Show[{Plot[%, {x, 1, 6}], ListPlot[{2, 3, 5, 7, 11, 13}]}]
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QUICK REFERENCE: Data Visualization »

QUICK REFERENCE: Curve Fitting & Approximate Functions »