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Homework Help: Can anyone tell me if my answer is correct?

  1. Dec 13, 2012 #1
    You have a random sample of size n from a normal distribution with unknown mean μ and variance 100. You want to find n large enough so that the length of the confidence interval (from left endpoint to right endpoint) is at most .2. Find such a value of n so that n is as small as possible. If you instead were willing to have a confidence interval with twice this length, what would you need to do to n? (Note: All confidence intervals in this problem are 95 percent confidence intervals.)

    I attached my answer...

    Attached Files:

  2. jcsd
  3. Dec 13, 2012 #2


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    Looks right.
  4. Dec 13, 2012 #3
    Thanks :)
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