Moderate
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.
Last updated
Practise Descriptive Statistics
238 free Descriptive Statistics MCQs from Statistics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Statistics questions like this
Statistics is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.