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...