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Math Help - Relative standard deviation vs t-test

  1. #1
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    Relative standard deviation vs t-test

    Hi Guys, hope you can help!

    I'm doing some chemistry analysis in which I run 6 replicate injections of my standard preparation, followed by my sample injections. However, in order to ensure the system is running ok, I run 2 injections of the same standard prep after every 6 sample injections.
    Am I right in thinking the best (only?) way of comparing the initial 6 standard injections with the first 2 system suitability injections is to perform a t-test on the means of the results? I've been told that I can take the means and compare them using RSD but this seems very wrong to me....
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  2. #2
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    Quote Originally Posted by topcat2000 View Post
    Hi Guys, hope you can help!

    I'm doing some chemistry analysis in which I run 6 replicate injections of my standard preparation, followed by my sample injections. However, in order to ensure the system is running ok, I run 2 injections of the same standard prep after every 6 sample injections.
    Am I right in thinking the best (only?) way of comparing the initial 6 standard injections with the first 2 system suitability injections is to perform a t-test on the means of the results? I've been told that I can take the means and compare them using RSD but this seems very wrong to me....
    This has stood for more than a day so I'll toss my two cents in and say that I'd use a t-test.
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