Standard deviation is zero
The standard deviation of a data set is , Which of the statements must be true?
A. The data set is empty.
B. The mean of the data set is .
C. The data elements are all unique and there is a constant difference between all of the elements.
D. The sum of the differences between each element and the mean is zero.
E. All of the data elements are equal to .
F. Half of the data elements are positive and half are negative.
G. All of the data elements have the same value.
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