This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Why is the null hypothesis in a correlation hypothesis test usually that the population correlation ... (Read 62 times)

asmith134

  • Hero Member
  • *****
  • Posts: 576
on: Jun 20, 2018
Why is the null hypothesis in a correlation hypothesis test usually that the population correlation is zero?
 
  What will be an ideal response?

Question 2

Why would a correlation of .5 be just as useful as a correlation of .5?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

jaymee143

  • Sr. Member
  • ****
  • Posts: 341
Reply #1 on: Jun 20, 2018
Answer to Question 1

It is partly due to tradition, but there's also a reason. We hypothesize that the population correlation is zero because (1) correlation = 0 is the midpoint between positive and negative correlations; and (2) zero correlations between variables are important; they indicate that the two variables are independent.

Answer to Question 2

Because it is the size of the correlation and not the sign that indicates the magnitude of the relationship between the variables. Both .5 and .5 indicate 25 percent shared variance between the variables.


asmith134

  • Member
  • Posts: 576
Reply 2 on: Jun 20, 2018
Thanks for the timely response, appreciate it

steff9894

  • Member
  • Posts: 337
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.

Did you know?

Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

Did you know?

Your heart beats over 36 million times a year.

Did you know?

In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

Examining the survivorship curve of a Dall mountain sheep population reveals information on the caus Examining the survivorship curve of a Dall mountain sheep population reveals information on the caus
An Inkblot Similar to One of the Blots that Appear in the Rorschach Inkblot Test An Inkblot Similar to One of the Blots that Appear in the Rorschach Inkblot Test
Working-Age Fraction of the U.S. Population, 1950–2050 Working-Age Fraction of the U.S. Population, 1950–2050
Calico cat illustrates the Lyon hypothesis Calico cat illustrates the Lyon hypothesis
A test field of GM papaya A test field of GM papaya
Translation at endoplasmic reticulum–bound ribosomes and the signal hypothesis Translation at endoplasmic reticulum–bound ribosomes and the signal hypothesis
Video: Monohybrid crosses

For a complete list of videos, visit our video library