# Chapter 3 - Statistics for Describing, Exploring, and Comparing Data - 3-3 Measures of Variation - Beyond the Basics - Page 112: 46

The sample mean absolute deviation is not an unbiased estimator of the mean absolute deviation of a population.

#### Work Step by Step

Mean: sum of all values divided by number of values: $mean=\frac{0+1+6+1+0+5+6+5+0}{9}=\frac{8}{3}\ne\frac{22}{3}.$ Hence the sample mean absolute deviation is not an unbiased estimator of the mean absolute deviation of a population.

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