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Statistics hw help

  1. Jun 21, 2010 #1
    1. The problem statement, all variables and given/known data

    I need help solving this problem:

    Let A, B, C, D, and E are 6 units of a population. The measurements associated with A, B, C. D, E units are 76, 77, 78, 81, and 82, respectively.

    -Find the population mean and its standard deviation

    -List all possible samples of size 3 from those 5 units

    -From each sample, compute the mean, standard deviation, and 95% confidence interval. Use t-distribution to estimate the tα/2 because we have a small size.

    -How many intervals contain population mean? Can you verify your result with empirical rule? Do they agree?

    2. Relevant equations

    3. The attempt at a solution

    I know the mean is 78.8 and standard deviation is 2.58844
  2. jcsd
  3. Jun 21, 2010 #2
    I have solved out everything, I just need help to know how I get the t-distribution?
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