These may seem like simple concepts, but they can tell you a lot about a dataset, and understanding their calculation is key to further quantitative work.

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Resource: Measuring center in quantitative data (Khan Academy) 

Type: Multimedia tutorial 
Who it’s for: Anyone with an understanding of basic arithmetic 
Why we love it: This tutorial provides videos, articles, and interactive practice problems that will help ensure you understanding how and when to use different measures of centre. 

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Resource: Central Tendency: Mean, Median, Mode (Introduction to Applied Statistics for Psychology Students – University of Saskatchewan Open Press) 

Type: Textbook chapter  
Who it’s for: Learners with an understanding of basic arithmetic and who are comfortable with mathematical notation 
Why we love it: This resource will introduce to the notation for presenting and calculating mean, median, and mode that you are likely to encounter in social science research. The mathematical notation and Greek letters may be a bit intimidating at first, but the content is clearly presented, and all the symbols are explained.