Results 1 to 2 of 2

Math Help - correlation coefficients

  1. #1
    Newbie
    Joined
    Mar 2008
    Posts
    5

    correlation coefficients

    Hi there everyone, if anyone could help me it would be appreciated.

    I need to know if any of the following statements concerning the correlation coefficient are true
    A) it is a unitless measure of the linear association between 2 variables
    B) the range of values it can take is not restricted
    C) a strong linear relationship, either positive or negative, between 2 variables indicates that 1 varaible must cause changes in the other variable
    D) It is possible for a large correlation coefficient, either positive or negative, to be produced simply by chance
    E) r=0 indicates there is definately no linear relationship between the two variables
    F) r=-1 indicates that all points on a scatter diagram could be connected by a downward sloping straight line
    G) r=-0.7 indicates a stronger linear relationship between the variables than if the correlation coefficient were -0.4

    I have done lots of research and think that A, E and F are true, the others I am not sure!

    Thanks!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Forum Admin topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    9,667
    Thanks
    298
    Awards
    1
    Quote Originally Posted by iamterribleatmaths View Post
    Hi there everyone, if anyone could help me it would be appreciated.

    I need to know if any of the following statements concerning the correlation coefficient are true
    A) it is a unitless measure of the linear association between 2 variables
    B) the range of values it can take is not restricted
    C) a strong linear relationship, either positive or negative, between 2 variables indicates that 1 varaible must cause changes in the other variable
    D) It is possible for a large correlation coefficient, either positive or negative, to be produced simply by chance
    E) r=0 indicates there is definately no linear relationship between the two variables
    F) r=-1 indicates that all points on a scatter diagram could be connected by a downward sloping straight line
    G) r=-0.7 indicates a stronger linear relationship between the variables than if the correlation coefficient were -0.4

    I have done lots of research and think that A, E and F are true, the others I am not sure!

    Thanks!
    A) Yes
    B) No
    C) Likely, not definite
    D) Extremely unlikely, but possible
    E) It is not possible for r to be 0
    F) Yes
    G Yes

    -Dan
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 7
    Last Post: August 31st 2010, 05:35 AM
  2. Average rank correlation coefficients
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: April 12th 2010, 02:41 AM
  3. correlation
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: March 22nd 2010, 02:46 AM
  4. Correlation
    Posted in the Statistics Forum
    Replies: 2
    Last Post: October 28th 2009, 06:50 PM
  5. sample correlation and population correlation
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: November 23rd 2008, 03:31 PM

Search Tags


/mathhelpforum @mathhelpforum