Suppose that you add 3 to all observations in a sample. How does this change the sample mean? How does it change the sample standard deviation? A The mean is increased by 3. The standard deviation isn't changed. The mean is increased by 3. The standard deviation is increased by 2. The mean is increased by 1.5. The standard deviation isn't changed. D This mean is increased by 2. The standard deviation is decreased by 3. The mean is increased by 3 The standard deviation isn't changed. The mean is increased by 3. The standard deviation is decreased by 3.

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