1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Statistics linear transformation rescale

  1. Aug 31, 2010 #1
    1. The problem statement, all variables and given/known data
    Mean of 25 and standard deviation of 5. Rescale the test using linear transformation so that the mean is 100?
    and the standard deviation is 20...



    2. Relevant equations
    xnew=a+bx


    3. The attempt at a solution
    I dont know...15+4x? I really dont understand how to calculate this. I read my book and its useless! Any help? :)
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Aug 31, 2010 #2

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    Where did you get the "15"? 4(25)= 100 and 4(5)= 20. Looks to me like you just want to multiply by 4.

    "I read my book and it is useless"
    Then you can do nothing to improve the situation.

    "I have trouble understanding my book"
    Then you can work on reading the book more carefully and improve the situation.

    Which do you prefer?
     
  4. Aug 31, 2010 #3
    well the first one is true but I'd prefer the second one.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Statistics linear transformation rescale
  1. Linear Transformation (Replies: 4)

  2. Linear transformations (Replies: 21)

  3. Linear Transformation (Replies: 1)

Loading...