+ Reply to Thread
Results 1 to 3 of 3

Thread: Undergrads Probablity

  1. #1
    Points: 4, Level: 1
    Level completed: 7%, Points required for next Level: 46

    Posts
    1
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Undergrads Probablity




    Hi, Am I understand the students' score order correctly?
    On a psychology exam with m = 76 and = 12, Tom scored 8 points below the mean, Mary had a score of X = 73, and Bill had a z-score of z = –0.50. Place these three students in order from lowest to highest score. Explanation: Tom scored 8 below mean which is 68, 76-8= 68 m=76 Mary’s score is 73. Bill’s score= 70 I use this formula : Z = (X - µ))/(σ ) to transfer Bill’s z-score into a raw score as other students scores to compare them easily. TOM -Student with lowest score( received the lowest scores because he received grade 68 which is 8 scores below the mean) Bill - Student with middle score(he received grade 70 which is 6 scores below) Marry- Student with highest score(she received a highest score of 73 which is only 3 scores below mean). Bill's score z = (x-μ)/s -.50 = (x-76)/12 (-.5)*12 + 76 = x = 70

  2. #2
    Super Moderator
    Points: 13,151, Level: 74
    Level completed: 76%, Points required for next Level: 99
    Dragan's Avatar
    Location
    Illinois, US
    Posts
    2,014
    Thanks
    0
    Thanked 223 Times in 192 Posts

    Re: Undergrads Probablity

    Yes, you are essentially correct. However, you can just use the Z-scores: Lowest Tom Z=-0.666, Middle Bill Z=-0.50, Highest Mary Z=-0.25, which are all below the mean. I wonder who's teaching this course.

    The Z-score transformation is just a linear transformation.

  3. #3
    Devorador de queso
    Points: 95,940, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Awards:
    Posting AwardCommunity AwardDiscussion EnderFrequent Poster
    Dason's Avatar
    Location
    Tampa, FL
    Posts
    12,937
    Thanks
    307
    Thanked 2,630 Times in 2,246 Posts

    Re: Undergrads Probablity


    You could use z-scores but in this case it's less work to transform the one z-score into a raw score than it is to transform the two raw scores into z-scores.
    I don't have emotions and sometimes that makes me very sad.

+ Reply to Thread

           




Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats