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Why Use 40 Participants in Quantitative UX Research? - YouTube
3:40 - 40 participants gives a 15% margin of error and 95% confidence level (binary metrics)
selfdeterminationtheory.org – An approach to human motivation & personality
Info, research, questionnaires/scales, info on application to specific topics
How Many Participants for Quantitative Usability Studies: A Summary of Sample-Size Recommendations
40 participants is an appropriate number for most quantitative studies, but there are cases where you can recruit fewer users.
If You Want to Change the World, Design Your Data to do These Four Things
The Question Protocol: How to Make Sure Every Form Field Is Necessary :: UXmatters
When to Use Which User-Experience Research Methods
User Research: is more the merrier? – UX Collective
Small, medium or large — what sample size of users fits your study is a composite question. The magic number of 5 users may work magic in some studies while in some it may not. It depends on the constraints put on by project requirements, assumptions about problem discoverability and implications to the design process. Assess these factors to determine the number of users for your study: What’s the nature and scope of research — is it exploratory or validatory? Who and what kind of users are you planning to study? What’s the budget and time to finish the study? Does your research involve presenting statistically significant numbers or inferring behavioural estimates for the problem statement?