This is the distribution of median earnings for different college majors. What makes the mean a good model of this distribution?
A. It's your only option, because you can't take the median of a group of medians.
B. The mean is always the best model for a skewed distribution.
C. The mean is the best statistic because we can simulate sampling distributions of the mean.
D. The mean is a model that spends only one degree of freedom and minimizes squared error.
Ans: D. The mean is a model that spends only one degree of freedom and minimizes squared error.
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