sample plans

  1. J

    Covariance of the population SxyU

    Hey, I need some help to figure out this problem! I'm asked to express SxyU, the covariance of the population, as a function of four totals and propose an estimator based on this result. I started something, but as you will see, I only have 3 totals and I'm not even sure of what I did. Should...
  2. C

    Sampling Plan Help

    Hi! I'm new to the forum. Hopefully this is the right place to post for some assistance. I have a business partner that asked about control charts, but I think he is looking more for an acceptance sampling plan. I have done this in the very distant past, but it's just been too long... :(...
  3. B

    statistical sampling plan

    I have a lot size of 120 cases. Each case contains 10 pieces so the total number of pieces is 1200. I want to take a warehouse sample to see if my defect level is less than 3%. I am assuming that the customer will accept the product 95% of the time if the defect level is less than 3%...