« previous next »

Author Question: The covariance of two variables X and Y: a. must be between -1 and +1. b. must be positive. c. ... (Read 164 times)

drink

  • Hero Member
  • *****
  • Posts: 554
on: Jun 24, 2018
The covariance of two variables X and Y:
 a. must be between -1 and +1.
  b. must be positive.
  c. can be any real number.
  d. None of these choices.

Question 2

If X and Y are random variables with E(X) = 6 and E(Y) = 9, then E(2X + 3Y) is:
 a. 39
  b. 15
  c. 27
  d. 12


ladyjames123

  • Sr. Member
  • ****
  • Posts: 346
Reply #1 on: Jun 24, 2018
Answer to Question 1

C

Answer to Question 2

A


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

drink

  • Hero Member
  • *****
  • Posts: 554
Reply #2 on: Jun 24, 2018
Correct answers!


ladyjames123

  • Sr. Member
  • ****
  • Posts: 346
Reply #3 on: Jun 24, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

Did you know?

Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

Did you know?

GI conditions that will keep you out of the U.S. armed services include ulcers, varices, fistulas, esophagitis, gastritis, congenital abnormalities, inflammatory bowel disease, enteritis, colitis, proctitis, duodenal diverticula, malabsorption syndromes, hepatitis, cirrhosis, cysts, abscesses, pancreatitis, polyps, certain hemorrhoids, splenomegaly, hernias, recent abdominal surgery, GI bypass or stomach stapling, and artificial GI openings.

Positive regulation of the lac operon by the catabolite activator protein (CAP) Positive regulation of the lac operon by the catabolite activator protein (CAP)
(A) Scratch test; patient is exposed to allergens through a light scratch on the skin; (B) Positive (A) Scratch test; patient is exposed to allergens through a light scratch on the skin; (B) Positive
Continuous positive airway pressure (CPAP) device. The sleeping subject is receiving the benefits of Continuous positive airway pressure (CPAP) device. The sleeping subject is receiving the benefits of
Positive Babinski’s sign. Positive Babinski’s sign.
Positive and negative selection during T-cell development. Positive and negative selection during T-cell development.
The cell wall of a Gram-positive bacterium, S. aureus The cell wall of a Gram-positive bacterium, S. aureus
Video: Fetal development - Weeks 9 to 38

For a complete list of videos, visit our video library