Problem 2 Suppose X And Y Are Independent Random Variables. The Variance Of X Is Equal To 16; And The Variance Of Y Is Equal To 9. Let Z = X – Y. What Is The Standard Deviation Of Z? (A) 2.65 (B) 5.00 (C) 7.00 (D) 25.0 (E) It Is Not Possible To Answer T

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I’m studying for my Probability class and need an explanation.

Problem 2

Suppose X and Y are independent random variables. The variance of X is equal to 16; and the variance of Y is equal to 9. Let Z = X – Y.

What is the standard deviation of Z?

(A) 2.65

(B) 5.00

(C) 7.00

(D) 25.0

(E) It is not possible to answer this question, based on the information given.Chapter 10 Discussion – Psychology and Health: nursing case study help
I’m trying to study for my Psychology course and I need some help to understand this question.

Answer these questions:

1-Do you find you are more likely to get sick when your stress level is high?

2_What would it be like to have no stress. Imaging switching places with a well-fed, much-loved, pampered house cat. Would that appeal to you? Do you sometimes do things that intentionally bring stress into your life?

3_Have you known someone with PTSD? Did the person mirror the description of psychological problems listed in the text?Problem 3 Which of the following is a discrete random variable? I. The average height of a randomly selected group of boys. II. The annual number of sweepstakes winners from New York City. III. The number of presidential elections in the 20th century. (
I’m working on a Probability exercise and need support.

Problem 3

Which of the following is a discrete random variable?

I. The average height of a randomly selected group of boys.

II. The annual number of sweepstakes winners from New York City.

III. The number of presidential elections in the 20th century.

(A) I only

(B) II only

(C) III only

(D) I and II

(E) II and III

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