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30 Oct 2009, 09:32
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Forgive me if I am wrong, but I truly believe the answer to this question to be "D."
The stimulus is asking:
Is the standard deviation of T positive?
Well,... stem question #1 clearly states that all elements of set T are positive. Thus, it is given that the ultimate standard deviation of set T is, in fact, positive.
Am I wrong?
The stimulus is asking:
Is the standard deviation of T positive?
Well,... stem question #1 clearly states that all elements of set T are positive. Thus, it is given that the ultimate standard deviation of set T is, in fact, positive.
Am I wrong?
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30 Oct 2009, 12:02
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A doesn't necessarily need to hold true.
If your data contain all the same number your standard deviation would be 0 which is not a positive number.
In B we know that the standard deviation is = 0 (range is 0) and therefore it is not positive.
If your data contain all the same number your standard deviation would be 0 which is not a positive number.
In B we know that the standard deviation is = 0 (range is 0) and therefore it is not positive.
31 Oct 2009, 17:52
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we are never told how many numbers are contained in the set. The standard deviation is zero if there is one number or all the numbers are the same
