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Confidence interval

  1. May 8, 2005 #1
    What is the 95% confidence interval for 100 ohm resister with 10% tolerence?

    Here is my work so far, can someone please tell me if I am doing it wrong or right? Thank you in advance.

    from table 95%: k = 1.96
    100 * 0.1( which is the 10% tolerance) = 10

    10 / sigma >= 1.96
    Sigma <= 5.10204

    confidence interval limits:
    100ohm +- 1.96(5.10204ohms) = 100ohm +- 10ohms
     
  2. jcsd
  3. May 10, 2005 #2
    Maybe my definition of tolerance is wrong, but isn't 1 sigma = 10% * 100ohms = 10 ohms?

    A 95% confidence interval would then be +/- 1.96 sigma.
     
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