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Homework Help: [Statistics] measuring values against known value

  1. Jan 30, 2013 #1
    1. The problem statement, all variables and given/known data
    You use a standard gram weight of known weight (x) to check the accuracy of a balance. For one balance, this standard is weighed 3 times yielding the following values; a, b, and c. Calculate the 95% confidence limit for the mean

    2. Relevant equations
    general statistics and mean equations

    3. The attempt at a solution
    I am confused how to do this problem because of the known value. At first I did the problem ignoring the known value and going through all the motions (figuring the mean, standard dev, and then plugging into ts/n^1/2 for 2 degrees of freedom) but how do things change because of the known weight and "testing for the accuracy of the balance"?
  2. jcsd
  3. Jan 30, 2013 #2
    Nevermind y'all, was a silly mistake. I can easily do a one sample t test
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