difficult

  1. M

    When do I use chi square and when a t-test? I just don't get the difference...

    Hi there, I'm trying to teach myself statistics from a book but I don't understand when I have to use t test and when chi squares. I tried to look it up on google but I still don't get it! To what I understood, you use BOTH for determining if there's a difference between groups and if this...
  2. P

    Tricky probability problem

    Hi, I was wondering if you could help me out with a problem I have: I need to work out the probability that someone will be able to complete a minimum of 10 hours of rehearsals in one week. The probability that this person is free each day is 60% on a weekday and 30% on the weekend. There are...