If 10 is added to every value in a data set, what happens to its standard deviation?
Correct answer: C. It remains unchanged
- A. It increases by 10
- B. It decreases by 10
- C. It remains unchanged
- D. It becomes 10 times larger
Explanation
Adding the same constant shifts every observation and the mean by the same amount. The deviations from the mean do not change, so the standard deviation remains unchanged.
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