What is the problem with using the "mean difference from the mean" as a measure of variability? a) The mean of the differences from the mean is an underestimate of the variability of the yi around the mean. b) The value of the mean difference from the mean depends on whether you sum (yi - mean) or (mean - yi) over all the values. c) The mean of the differences from the mean is always zero. d) The mean of the differences from the mean is an overestimate of the variability of the yi around the mean.

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