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Beyond the Usability Lab by Donna Tedesco, Thomas Tullis, William Albert

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2.7. Participant Sampling

One of the most important decisions in conducting an online study is how to obtain a sample of participants. The first goal is to identify the number of participants needed to complete the study. Then you'll want to determine the appropriate sampling method needed to obtain the participants.

This section touches on some complex topics, including statistical effects, significance, and sampling techniques. These are typically not a focus in lab-based usability testing, as it involves such a small number of participants. But because online studies involve large numbers of participants, these are useful concepts to become familiar with. You may not internalize them in one sitting, but they will at least provide a sense ...

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