The Cauchy distribution has the density function
which is symmetric about zero. This distribution has very heavy tails, which cause the arithmetic mean to be a very poor estimate of location. Simulate the distribution of the arithmetic mean and of the median from a sample of size 25 from the Cauchy distribution by drawing 100 samples of size 25 and compare. From Example B in Section 3.6.1, if Z1 and Z2 are independent and N(0, 1), then their quotient follows a Cauchy distribution. (This gives a simple way of generating Cauchy random variables.)
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