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  1. C

    Calculating Ppk and Cpk. Am I doing this right?

    Hi all. I am trying to make sure that I am doing this the right way. I hope you guys will look through my calculations. First, I have a list of 42 measurements. They are presented lower on the page. LSL = 4.070, USL = 4.090. Now, I want to calculate Ppk from the data. I take the mean and SD of...
  2. C

    Removing influences (operator, material differences) from samples

    Hi all I will try to explain to the best of my abilities. My coworker and I has been tasked with finding out how a turning machine in our production facility performs, but we have do this retrospectively - if possible, we will use data from very recent productions. The machine is running for...
  3. C

    R: is my t.test and reasoning correct?

    Hi all. My first post here :) I am doing my master's, and I have samples from two different places. I have been measuring aerobic bacterial counts, 7 from place C and 4 from place f. I want to ascertain if there is a difference :) C <- c(6.9, 8.2, 9.4, 9.2, 7.3, 6, 8.6) f <- c(5.4, 7.1...