Displaying and describing data

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Statistics gives us the tools to effectively answer questions using data. So the first step in actually doing statistics is to form a question! This tutorial looks at what type of questions we deal with in statistics.
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Histograms display how many numerical data points there are in each "bucket" of values.
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Stem-and-leaf plots are another way to plot numerical data. They combine the best features of dot plots and histograms. Turn your head sideways and look at a stem-and-leaf plot and you'll see what we mean.

Line graphs show change over time in a numerical variable.
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Standard deviation tells us how far away from the mean each data point typically is in a set of numbers. How we calculate standard deviation depends on whether the data represents an entire population or came from a sample. This tutorial focuses on the data that represents an entire population.
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