+ Reply to Thread
Page 2 of 2 FirstFirst 1 2
Results 16 to 19 of 19

Thread: Urgent, which test can I use to test this hypothesis???

  1. #16
    Points: 811, Level: 15
    Level completed: 11%, Points required for next Level: 89

    Posts
    10
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: Urgent, which test can I use to test this hypothesis???




    ok a part from the test, which plot or graph can show the variation of my results? it might be more infomative than doing hypothesis test!!
    Last edited by nane; 07-17-2011 at 02:21 PM.

  2. #17
    TS Contributor
    Points: 8,362, Level: 61
    Level completed: 71%, Points required for next Level: 88

    Location
    Crete, Greece
    Posts
    717
    Thanks
    0
    Thanked 35 Times in 34 Posts

    Re: Urgent, which test can I use to test this hypothesis???

    ok, so you have the 50 averages, a 95% confidene interval for the variance will show you where the variance "moves". You have to how large is large for you. I meant chi-square when I said chi-square. The distribution of the sample variance is a scaled chi-square. That is how you create the 95% confidence interval. A plot to do is a simple histogram and you see the shape of the distribution of the data. Do a box-plot to also. The question is, are you interested in the variance or the mean of the measures? Try also to see the quartiles and how many obervations are -+1 s.d. from the mean, -+2s.d. from the mean and _+2.5 and 3_+ s.d. from the mean. This might be more informative.

  3. #18
    Points: 811, Level: 15
    Level completed: 11%, Points required for next Level: 89

    Posts
    10
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: Urgent, which test can I use to test this hypothesis???

    I think we are more interested in the variance. Thanks for your suggestions !! very helpful

  4. #19
    Devorador de queso
    Points: 95,781, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Awards:
    Posting AwardCommunity AwardDiscussion EnderFrequent Poster
    Dason's Avatar
    Location
    Tampa, FL
    Posts
    12,933
    Thanks
    307
    Thanked 2,629 Times in 2,245 Posts

    Re: Urgent, which test can I use to test this hypothesis???


    Quote Originally Posted by Masteras View Post
    The distribution of the sample variance is a scaled chi-square.
    Note that there would be quite a few assumptions that have to be true for the sample variance to be a scaled chi-square.

+ Reply to Thread
Page 2 of 2 FirstFirst 1 2

           




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