THINKING, FAST & SLOW (DANIEL KAHNEMAN) - Listening books
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The Importance of Choosing a Small Sample Size
Researchers who pick too small a sample leave themselves at the mercy of sampling luck. The risk of error can be estimated for any given sample size by a fairly simple procedure. Traditionally, however, psychologists do not use calculations to decide on a sample size. They use their judgment, which is commonly flawed.
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