confidence level

  1. S

    Random Sample Generation w/out Knowing P

    I'm trying to solve the following issue: I have two decks of cards. One deck of cards has 40 cards and the other deck has 30 cards. The makeup of cards in both decks is unknown to the tester, however, the tester knows that neither deck contains duplicate cards, respectively. The ultimate goal of...
  2. R

    Confidence level and Margin of Error applied to Satisfaction surveys

    Hello, New to the forum, relatively new to stats as well! So I think I've managed to confuse myself and am going around in circles with this, so help would be appreciated. I'll outline what i'm trying to achieve and what data I have available below: So, i'm sending out satisfaction surveys...
  3. I

    How to determine number of data points and period of data to determine confidence?

    Dear Statisticians I have done some experiments, with continuously data acquisition, on shrinkage measurements over time. My data shows exponential regression curves. Based on the data I want to estimate how many data points and at what time the data should be gathered, to obtain a certainty...
  4. Q

    Value at Risk: Model Validation

    I am new to the forum so I hope I am posting in the correct place. PROBLEM: As I am exposed to upper risk in one particular marketed security, I want to set 90 % upper confidence levels for 15 and 30 days going forward. The problem advances as I am tracking the 30 day moving average of this...
  5. J

    Calculate the number of trials to distinguish between 2 binomial distribution models

    Hello, This sounds like a problem that has to be well known, but I can't find a good answer... I have two competing models for the fraction of special objects ('n') in a sample ('N'). One model predicts that f= n/N = 0.15 of the objects are special, the other that f = 0.3 are special. Ie...