Author Question: If X and Y are two variables with x = 3.8, y = 4.2, and COV(X, Y) = -0.25, then V(X + Y) = 31.58. ... (Read 60 times)

tth

  • Hero Member
  • *****
  • Posts: 579
If X and Y are two variables with x = 3.8, y = 4.2, and COV(X, Y) = -0.25, then V(X + Y) = 31.58.
  Indicate whether the statement is true or false

Question 2

If X and Y are two variables with E(XY) = 10.56, E(X) = 4.22, and E(Y) = 5.34, then COV(X, Y) = 1.0.
  Indicate whether the statement is true or false



kxciann

  • Sr. Member
  • ****
  • Posts: 356
Answer to Question 1

T

Answer to Question 2

F



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

Did you know?

During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

Did you know?

Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

Did you know?

Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

For a complete list of videos, visit our video library