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Example 106.5


Example 106.5: In a paper titled, “The Role of Deliberate Practice in the Acquisition of Expert Performance” researchers estimated that it takes approximately 10,000 hours of deliberate practice to become an expert at something.  If we want to estimate the average time that it would take to become an expert guitarist within 200 hours, how large should our sample of expert guitarists be?  Assume the standard deviation is 850 hours, and that we want a 95% confidence level.


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