+ Reply to Thread
Results 1 to 4 of 4

Thread: Z-scores for probability in tails

  1. #1
    Points: 2,980, Level: 33
    Level completed: 54%, Points required for next Level: 70

    Location
    Northern, VA
    Posts
    1
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Z-scores for probability in tails




    I haven't done any stats in years and now I am in a course for my grad program and I am so lost. My teacher is very confusing and I am trying my best to make sense of the way of going about finding z-scores in probability in tails. Do anyone know a good place that would illustrate the way to use the table and what the values of the tables are in layman's terms?


    This is the type of problem that I am having problems with:

    Trying to find the z-score for which a total probability of .02 falls more than z standard deviations (in either direction) from the mean, that is below mean-zo or mean+zo. Not sure how to type special characters but the o = standard deviations.

    If anyone could help, I would greatly appreciate it. Getting past this type of problem would be huge for me.

    Thanks,

    Rich

  2. #2
    Points: 4,663, Level: 43
    Level completed: 57%, Points required for next Level: 87

    Posts
    118
    Thanks
    1
    Thanked 1 Time in 1 Post
    For the probability of 96% ( 2% plus or minus ), Z is 2.05.
    Please also note that Z scores for 99%, 95%, 90%, and 80% are 2.59, 1.96,1.64 and 1.28 respectively.

  3. #3
    Points: 5,984, Level: 50
    Level completed: 17%, Points required for next Level: 166

    Location
    Mumbai, India
    Posts
    142
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Dear, for total probability of 2 % total area within +or- 2*sigma will be 98%.Z value corresponding to 98% is 2.33

  4. #4
    Points: 4,663, Level: 43
    Level completed: 57%, Points required for next Level: 87

    Posts
    118
    Thanks
    1
    Thanked 1 Time in 1 Post

    Quote Originally Posted by dmmarathe View Post
    Dear, for total probability of 2 % total area within +or- 2*sigma will be 98%.Z value corresponding to 98% is 2.33
    I have taken into account 2 on left tail and 2 on right tail, which make 4 resulting in a confidence level of 96%. This is what I felt with my limited knowledge.

+ Reply to Thread

           




Similar Threads

  1. T-scores, n1, n2, and probability
    By magic_shield2001 in forum Statistics
    Replies: 0
    Last Post: 04-18-2011, 12:26 AM
  2. Replies: 0
    Last Post: 08-31-2010, 12:20 AM
  3. Probability difficulties and Z scores
    By Deganveran in forum Probability
    Replies: 4
    Last Post: 02-28-2010, 04:52 PM
  4. Replies: 6
    Last Post: 08-26-2009, 06:44 AM
  5. z-scores
    By invictuah in forum Statistics
    Replies: 1
    Last Post: 06-30-2007, 03:21 PM

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