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

Related Mcqs:

1. 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

2. A set of events is said to be independent if probability of head on tossing a coin is _______________?

   A. 1/2
   B. 2/3
   C. 1
   D. 3/4

3. If x and y are Independent to each other the coefficient of correlation is _____________?

   A. -1
   B. +1
   C. .6
   D. 0

4. Let Z1,Z2,….Zn be independent and identically distributedrandom variable, satisfying E[ι Zt ι]<∞. Let N be an integer valued random variable whose value n depends only on the values of the first n Z¡'s. Suppose E(N)< ∞, then E(Z1,Z2,….Zn)=E(N)E(Z) is called ?

   A. Independence Equation
   B. Sequential Probability Likelihood Equation
   C. Neyman Pearson Lemma
   D. Wald’s Equation

5. Var(2X+3) is________________?

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

6. Geometric means of X1 and X2 is________________?

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

7. The Harmonic Mean of any two numbers is________________?

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

8. We use normal distribution when “n” is________________?

   A. Small
   B. None
   C. Fixed
   D. Large

9. In a normal distribution E(X-µ)2 is________________?

   A. Variance
   B. Mean Deviation
   C. Standard Deviation
   D. Quartile Deviation

10. Results obtained by counting are_____________?

    A. Continuous
    B. Discrete
    C. Both (a) and (b)
    D. None of these