If a & b are constants, then Var (a + bX) equal to_________________?

Related Mcqs:

1. If a and b are two constants, then Var(a+bX) is_______________?

   A. a±bVar(X)
   B. Var(a)±Var(X)
   C. ±bVar(X)
   D. b2Var(X)
   E. (a±b)Var(X)

2. For two independent random variables X & Y, Var (x ± y)=___________?

   A. Var(X) + Var (Y)
   B. Var(X) – Var (Y)
   C. Var (X)±
   D. Zero

3. Var (kY)= ____________?

   A. k Var (Y)
   B. k2 Var(Y)
   C. Var(Y)
   D. k2

4. The variance of randomvariable of x then var(x) = E[x-E[x]2 = E[________]?

   A. (X – A)2
   B. E(x)
   C. (x – u)2
   D. (x – 4)2

5. Var(2X+3) is________________?

   A. 5 Var(X)
   B. 4 Var(X)
   C. 4 Var(X)+3
   D. 5 Var(X)+3

6. if Var(θˆ)→0 as n → 0, then θˆ is said to be______________?

   A. Sufficient
   B. Efficient
   C. Unbiased
   D. Consistent

7. if Var(T2)_______________?

   A. Efficient
   B. Sufficient
   C. Unbiased
   D. Consistent

8. The median of normal distribution corresponds to the value of Z equal to_________________?

   A. 0.5
   B. 1
   C. µ
   D. 0

9. A scaling factor is used to_________________?

   A. Change a simple index to a weight index
   B. Convert the Paasche index to a Laspeyres index
   C. Change the base year
   D. change an aggregate index to a weighted index

10. For discrete random ‘X’, the expectation of X i.e., E(x) is equal to:________________?

    A. ∑P(x)
    B. ∑x.P(x)
    C. ∑x²P(x)
    D. One