Results 1 to 4 of 4

Math Help - I dont get this..i need help

  1. #1
    Newbie
    Joined
    Apr 2009
    Posts
    6

    I dont get this..i need help

    The scores for players' first and second games at a bowling tournament are shown below.
    First Game Second Game
    169 175
    150 162
    202 195
    230 241
    187 185
    177 235
    164 171

    a. Determine the correlation coefficient.
    b. Find the equation of the line of best fit analytically.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28
    Quote Originally Posted by nithujaa View Post
    The scores for players' first and second games at a bowling tournament are shown below.
    First Game Second Game
    169 175
    150 162
    202 195
    230 241
    187 185
    177 235
    164 171

    a. Determine the correlation coefficient.
    Hi there, you should assign your first list to be your X values and second to be your Y values, now check out this link.

    Pearson product-moment correlation coefficient - Wikipedia, the free encyclopedia

    That gives you the formula for 'r' the correlation coefficient you are after.

    first find mean of X and Y then the standard deviation of X and Y.

    To do the calcs I suggest you make a table with the following field headings.

    X, X-meanX, Y, Y-meanY
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by nithujaa View Post
    The scores for players' first and second games at a bowling tournament are shown below.
    First Game Second Game
    169 175
    150 162
    202 195
    230 241
    187 185
    177 235
    164 171

    a. Determine the correlation coefficient.
    b. Find the equation of the line of best fit analytically.
    Surely you can use technology - just enter the given data into an appropriate software package or use a calculator that can do linear regression.

    If you have to do it by hand, my first piece of advice is to go to your textbook or class notes and look up the required formulas. Then start doing the required calculations. It is a simple mechanical but tedious process. If you are stuck somewhere in this process, please show what you've done and where you get stuck.

    There is a difference between "I can't do it because it is intellectually difficult" and "I can't do it because it is tedious and I just can't face doing all those calculations". Your question falls into the latter category.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Apr 2009
    Posts
    6
    i got part a as the answer 0.73992 and dont get part b..i still need help with part b..and need to show the work for it.

    Correlation(r) = NΣXY - (ΣX)(ΣY) / Sqrt([NΣX2 - (ΣX)2][NΣY2 - (ΣY)2])
    -thats the equation i used for part a

    the equation that you are supposed to use for part b to find the equation of the line of best fit analytically is..
    y=ax+b, where a=n(Σxy)-(Σx)(Σy)
    ---------------------
    n(ΣX2)-(Σx)2
    _ _
    b=y-ax
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. I dont get it
    Posted in the Algebra Forum
    Replies: 10
    Last Post: August 4th 2010, 07:49 AM
  2. Help? i dont get it
    Posted in the Algebra Forum
    Replies: 2
    Last Post: April 7th 2009, 05:35 PM
  3. Replies: 5
    Last Post: December 3rd 2008, 06:44 PM
  4. I dont remember how to do this
    Posted in the Algebra Forum
    Replies: 2
    Last Post: November 4th 2008, 11:50 AM
  5. i dont know these answers, please help..
    Posted in the Calculus Forum
    Replies: 0
    Last Post: October 7th 2008, 07:45 PM

Search Tags


/mathhelpforum @mathhelpforum