confidence-interval

  1. O

    Incorporating physical limits into uncertainty

    I am working on a method for incorporating physical "limits" into error analysis, specifically a 95% confidence interval. For example, consider a process where a known mass of A enters a system, and after the process occurs, masses B and C exit. We can measure the mass of B but not the mass of...
  2. Y

    Average of standard deviation as repeat accuracy for five measurement series

    Hi there, I hope you can help me with the following question. I measured the power input and output of a storage and retrieval vehicle with 1,000 single measuring points. I repeated the measurement five times with the same measure method and same time steps. The result is five measurement series...
  3. D

    Minimum P to sample boxes

    I have N boxes, each of which may or may not contain a ball. I want to know how many boxes have balls by sampling the boxes in the following way. For each box in the N boxes: I open this box with probability P If at the end I find out K boxes have a ball, I estimate the number of boxes...
  4. R

    Negative confidence intervals in regression

    Hi all, So I'm really stumped. Basically I have a negative standardised coefficient value of -0.35, and a 95% CI equals (-0.47, -0.23). I'm having trouble interpreting the interval because it's negative. I'd have thought that, the lower and upper bounds would be reversed. Because if the...
  5. V

    Confidence interval when data is in range

    I am trying to calculate the confidence interval when data is given in range. Example: Rather than telling their exact age in years, 9 sample students from a class tell their age as: (23 +/-1) ; (22 +/-1) ; (20 +/-2 ) ; (25 +/-2) ; (24 +/-2) ; (25 +/-3) ; (22 +/-3) ; (24 +/-4) ; (25 +/-...