Var(2X+3) is________________?

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

   A. Var(bX) + a
   B. b2 Var(X)
   C. b Var(x)
   D. None of these

3. 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

4. Var (kY)= ____________?

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

5. 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

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. If X and Y are independent then SD (X − Y) is________________?

   A. SD(X)−SD(Y)
   B. SD(X)+SD(Y)
   C. SD(X)+SD(Y)−−−−−−−−−−−−−−√
   D. Var(X)+Var(Y)−−−−−−−−−−−−−−−√
   18) If Y=−8X − 5 and SD of X is 3, then SD of Y is

9. Geometric means of X1 and X2 is________________?

   A. X1+X2
   B. X1+X2x
   C. X1+X2−−−−−−−√
   D. X1×X2−−−−−−−√
   E. X1−−−√+X2−−−√

10. The Harmonic Mean of any two numbers is________________?

    A. a+b2
    B. 2aba+b
    C. ab−−√
    D. a+b