In the previous stage of the roadmap (category 18), we guided you towards an online crash course of statistics. Constituted of 22 lectures (about 10-12 minutes long each), this course teaches you the fundamental of statistics, using fun visuals and clear examples.
The video lessons #5 and #6 constitute by themselves a crash course in data visualization. Part 1 focuses on bar charts, pie charts, pictographs, and histograms and shows you what they can and cannot tell us about their underlying data. Part 2 takes a closer look at dot plots, box plots, and stem and leaf plots. It also talks about the rules you can use to identify outliers in your data.

Click here to watch the video lesson #5 (Part 1) and here for the video lesson #6 (Part 2).

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