7 of33 Sample Size Training
  Another way to think about sample size is how certain you want to be about your results. Let's say you're coaching a baseball team, and you see a young pitcher throw a 100 mph fastball. "Wow, that's fast!" you think.
  A baseball But before you hire him, don't you want to see him do it again? And again?? The more times you see him throw a 100 mph fastball, the more certain you are that he can do it again. You probably wouldn't think he's so hot if he could only throw like this once a year!
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