Ms. Parez gave an exam to her students during the first week of class. Since students performed poorly, she added 20 points to everyone's score so that nobody would feel too discouraged. In changing the scores this way, Ms. Parez influenced the standard deviation and range in which of the following ways?
A. The standard deviation increased, but the range remained constant.
B. The standard deviation remained constant, but the range increased.
C. Both the standard deviation and range increased.
D. Both the standard deviation and range remained constant.
Answer: D
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