suppose for 40 observation, the variance is 50. If all the observation are increased by 20, the variance of these increased observation will be_________?
Correct answer: A. 50
- A. 50
- B. 70
- C. 50/20
- D. 50-20=30
Explanation
Adding the same constant to every observation shifts the distribution without changing its spread. Hence the variance remains 50, even though the mean increases by 20.
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