+ Reply to Thread
Results 1 to 3 of 3

Thread: Reading z-tables when you know the probability

  1. #1
    Points: 1,379, Level: 20
    Level completed: 79%, Points required for next Level: 21

    Location
    Grangemouth
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Reading z-tables when you know the probability




    I'm having trouble reading z tables.

    If anyone can help I'd be thankful as I feel I can't move on until I know how to do this.

    One of the examples in my text book states the probability that z is greater than zi is 0.06.

    1-0.06 = 0.94. I get everything up to this point.

    Next, if we look up 0.94 in the body of the Table A it gives us a z-score of 1.56.

    I don't see how you can look this up in the table as the table only goes up to 0.5000. Is my table different?

    Can someone tell me where I would get 1.56 from? Thanks in advance

    I've watched a few online tutorial videos such as this one: http://www.youtube.com/watch?v=2Xp5y...eature=related on how to read the table and all they say is if you look at the table you will see... Umm not in my case!


    Any help would be appreciated.

    Many Thanks!
    Last edited by LiquidMoon; 11-18-2010 at 02:28 PM.

  2. #2
    Devorador de queso
    Points: 95,819, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Awards:
    Posting AwardCommunity AwardDiscussion EnderFrequent Poster
    Dason's Avatar
    Location
    Tampa, FL
    Posts
    12,935
    Thanks
    307
    Thanked 2,629 Times in 2,245 Posts

    Re: Reading z-tables when you know the probability

    One nice thing about the standard normal distribution is that it's symmetric. What this gives us is that P(Z < 1.56) = 1 - P(Z < -1.56).

    Well technically what that gives us is that P(Z > x) = P(Z < -x) but we can use this fact to derive the above fact.

  3. #3
    Points: 1,379, Level: 20
    Level completed: 79%, Points required for next Level: 21

    Location
    Grangemouth
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: Reading z-tables when you know the probability


    I managed to find a 2-sided table In Moore and McCabe's book 'Introduction to the practice of statistics'.

+ Reply to Thread

           




Similar Threads

  1. Meta-analysis reading
    By Penguin 101 in forum Statistics
    Replies: 1
    Last Post: 03-16-2011, 01:48 PM
  2. Reading ANOVA
    By Ashley910 in forum Statistics
    Replies: 1
    Last Post: 03-15-2010, 10:16 PM
  3. two probability levels in regression tables
    By godfather in forum Statistical Research
    Replies: 1
    Last Post: 06-24-2009, 01:24 AM
  4. Reading Required SAS Output
    By statsboi in forum SAS
    Replies: 1
    Last Post: 05-06-2009, 10:49 PM
  5. reading spreadsheet into R
    By WeeG in forum R
    Replies: 6
    Last Post: 01-01-2009, 07:00 AM

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