Another reason Excel pays so much attention to the normal distribution is that so many variables that interest researchers-in addition to the few just mentioned-follow a normal distribution. The normal distribution occupies a special niche in the theory of statistics and probability, and that's a principal reason Excel offers more worksheet functions that pertain to the normal distribution than to any other, such as the t, the binomial, the Poisson, and so on. Even that ridiculously abbreviated list is remarkable for a phenomenon that was only starting to be perceived 300 years ago. The title of a contentious and controversial book published in the 1990s. The number of times a fair coin comes up heads in ten flips follows a normal curve. The height and weight of people in your family, in your neighborhood, in your country each follow a normal curve. It's the foundation for grading "on the curve" when you were in elementary and high school. You cannot go through life without encountering the normal distribution, or "bell curve," on an almost daily basis. The Central Limit Theorem About the Normal Distribution Excel Functions for the Normal DistributionĬonfidence Intervals and the Normal Distribution
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