independent events

  1. M

    Joint Probability

    Hi All, I'm currently in a grad course with a nice complement of stats which we have been tasked to learn ourselves. Having some difficulties understanding joint probabilities. Specifically, I have a problem where we have 3 possible outcomes with probabilities p1=0.4, p2=0.1 and p3=0.5. If we...
  2. L

    Confidence Intervals in a research paper

    Hi, all. I'm writing a paper on concussion data from the NFL Surveillance System, and I want to be able to put the data analysis from the journal article in my own words, but I don't really understand what the researchers are saying. Here's the quote. Can someone please tell me basically what it...
  3. N

    Multiple Events and Cumulative Probability Calculation(s)

    Hi! I don't know statistics, hopefully someone will kindly help me. I'd like to learn how to calculate the probability of an event happening Y times if it has an X chance of occurring, so that I can calculate how many attempts at X chance are required to provide an 80% and 95% probability of...
  4. N

    Calculating number of individuals from probability

    Hello everyone, I am a little new to statistics - so sorry if this sounds very basic to most of you - but I have been scratching my head over this one for a while, and I would appreciate some help: Say, I have a 100 buildings, and I know the individual probability of each building to be...
  5. B

    Game Theory Question

    Hello gurus, I got involved in a debate with my sister this evening, and despite (what I thought) was a relatively simple problem, I couldn't provide a rigorous answer. I was hoping that someone on here could give me some insight. A casino she frequents will often give her "fake money" to...
  6. M

    Independent Event if A is a subset of B ???

    I have a questions regarding Conditional Probability. Two events A and B are independent if: P(AnB)=P(A)*P(B) Is this always the case or are there any cases in which the formula does not work. What happens if P(A) is within P(B). The intersection of those would then be equal to P(A)...