This topic contains a solution. Click here to go to the answer

Author Question: Why is the null hypothesis in a correlation hypothesis test usually that the population correlation ... (Read 78 times)

asmith134

  • Hero Member
  • *****
  • Posts: 576
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
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
:D TYSM


Liamb2179

  • Member
  • Posts: 365
Reply 3 on: Yesterday
Excellent

 

Did you know?

Medication errors are three times higher among children and infants than with adults.

Did you know?

The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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?

The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

For a complete list of videos, visit our video library