« previous next »

Author Question: If the standard deviations of X and Y are 15.5 and 10.8, respectively, and the covariance of X and Y ... (Read 82 times)

pragya sharda

  • Hero Member
  • *****
  • Posts: 566
on: Jun 24, 2018
If the standard deviations of X and Y are 15.5 and 10.8, respectively, and the covariance of X and Y is 128.8, then the correlation coefficient is approximately 0.77.
 a. True
  b. False
   Indicate whether the statement is true or false

Question 2

The ratio of two independent chi-squared variables divided by their degrees of freedom is:
 a. normally distributed
  b. Student t-distributed
  c. chi-squared distributed
  d. F-distributed


pikon

  • Sr. Member
  • ****
  • Posts: 361
Reply #1 on: Jun 24, 2018
Answer to Question 1

TRUE

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Did you know?

Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

Did you know?

People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

Did you know?

To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

Did you know?

As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

CycleBeads help women use the Standard Days Method. CycleBeads help women use the Standard Days Method.
Urinalysis. During a simple urinalysis, a stick with colored blocks is dipped into a urine specimen. Urinalysis. During a simple urinalysis, a stick with colored blocks is dipped into a urine specimen.
Standard Medical Record and Types of Reports Found in Record Standard Medical Record and Types of Reports Found in Record
How to sketch a quadratic equation that is in standard form (Question 1) How to sketch a quadratic equation that is in standard form (Question 1)
How to fully analyze the standard and factored form of a quadratic equation (Question 1) How to fully analyze the standard and factored form of a quadratic equation (Question 1)
The Standard Rain Gauge The Standard Rain Gauge
Video: HIV replication/ Replication cycle of HIV

For a complete list of videos, visit our video library