Ask statistical questions, choose the right plot, and describe data with measures of center and spread.
Each topic is a short page: read the walkthrough, watch the video, try the practice, then take a quick quiz. Go in order or jump to what you need.
When an answer varies — and how to describe the middle of the data.
Two ways to measure how spread out a data set is.
Match the graph to the kind of data you have.
By the end of this unit, you should be able to:
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