How Many Users Do I Need For Testing?
The UX Usability Podcast - A podcast by theusabilitypodcast
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Book: The Tao of Statistics: https://www.amazon.co.uk/gp/product/148337792X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=148337792X&linkCode=as2&tag=usergendesign-21&linkId=8fb6b7d0be4a43404a9b0be10851f26a
