Confidence interval

  • Thread starter vptran84
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  • #1
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Main Question or Discussion Point

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
 

Answers and Replies

  • #2
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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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