Statistical analysis of directional data is known as circular or directional statistics. The bestknown branch of it is generalized describing of wind directions. A lecture by Nour Malek and Frédéric Simard about circular statictics. Lecture notes by Paul Marr from the Shippensburg University about circular statistics. 
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ID  P  Question or exercise  

3974  3  The web site of Dutch climate contains public climatological data. The observation data for Maastricht is added to this exercise. Find from it the wind speed and direction data for years 19061912 and 20062012.

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4142  3  Sara was speaking with mobile phone, while she was walking in a park. There were attractive places such as entertainment zones, a lake, a restaurant and sitting places in the park that you can see in the attached image. She walks 15 meters towards East. Then she turns and starts walking to NorthEast for 25 meters. Then she walks to southeast for another 12 meters. Then to north 5 meters. He then turns to her left(west) where she walks for 45 meters.

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