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Homework Help: Calculate the standard deviance (statistics)

  1. Jul 2, 2011 #1
    (solved) Calculate the standard deviation (statistics)

    1. The problem statement, all variables and given/known data

    From this table of values, I'm supposed to calculate the standard deviance


    2. Relevant equations

    Up until this point, I've had no problem calculating the standard deviance with my calculator by going to STAT> CALC > 1 and entering the table.

    3. The attempt at a solution

    This is was my method of solving it this time, and my answer was 4.40. However, the answer in the example says to "Assume that the standard deviance is 3.50." I don't understand the basis of making such an assumption. How can I calculate the standard deviance in a way that will result in 3.50 as my answer?
    Last edited: Jul 2, 2011
  2. jcsd
  3. Jul 2, 2011 #2

    Stephen Tashi

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    Science Advisor

    Re: Calculate the standard deviation (statistics)

    If the question is saying to assume the population standard deviation is 3.5, this does not contradict getting a different answer for the sample standard deviation, which is what you calculated.

    The only wiggle room that I see for you in calculating the sample standard deviation is whether you divide by 19 (the samle size minus 1) or 20 (the sample size). I haven't checked the arithmetic you did.
  4. Jul 2, 2011 #3
    Never mind. I figured it out
    Last edited: Jul 2, 2011
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