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  1. S

    Probability and negative mean

    Thanks a lot obh. I think you made it quite clear for me. thanks a lot again. wish you the best.
  2. S

    Probability and negative mean

    Dear obh Thanks for your hint. Actually my problem is a little bit more confusing than that I could explain. I am reading a book, which is a double edged sword! sometimes it is great, sometimes .... :( I attached the part of the book that confused me! I would be glad to have some help on...
  3. S

    Probability and negative mean

    Hi guys I think I need some help. We are performing a pre-post analysis. it is believed that the average of the variable Y is 60 in pre-situation (Y1) and it is believed to become 55 in post-situation (Y2). we Define a new variable Y = Y2 - Y1 if Y is observed and known to be Y=-3.11, with a...