(A) Positive
(B) Negative
(C) 0
(D) 1
Tag: Statistics Mcqs
The standard deviation is always __ than mean deviation.
(A) Greater
(B) Less
(C) Equal
(D) None
The variance of 5 numbers is 10. If each number is divided by 2, then the variance of new numbers is__.
(A) 20
(B) 70
(C) 2.5
(D) 5.5
Suppose for 40 observations, the variance is 50. If all the observations are increased by 20, the variance of these increased observation will be__.
(A) 50
(B) 70
(C) 50/20
(D) 50-20 = 30
Var(2X+3) is__.
(A) 5 Var(X)
(B) 4 Var(X)
(C) 4 Var(X)+3
(D) 5 Var(X)+3
The variance of a constant is__.
(A) Zero
(B) Constant
(C) a
(D) None
If Y=−8X − 5 and SD of X is 3, then SD of Y is __.
(A) 8
(B) 3
(C) 5
(D) 24
For a symmetrical distribution approximately 68% of the cases are included between __.
(A) X¯¯¯¯−S and X¯¯¯¯+S
(B) X¯¯¯¯−2S and X¯¯¯¯+2S
(C) X¯¯¯¯−3S and X¯¯¯¯+3S
(D) None of these