Confidence interval

Decision Type:

Method Category:

Categories: Terms

A range of values, calculated from sample data, that includes, with a (100 – α) degree of certainty, the population parameter of interest. α, called the Level of Significance, is the probability of committing a Type I error.

Synonyms:

confidence bound

Reliability Testing
Statistical Confidence
Reliability Engineering Statistics
How to Attend a Reliability Conference
Improve Decision Making with Statistics

Effective resolution
The size of the data category when the total measurement system variation. This is determined by the length of the confidence interval based on the measurement system variation. The number of distinct categories (ndc) can be determined by dividing the size into the expected process distribution spread. For the effective resolution, a standard estimate of the ndc (at the 97% confidence level) is 1.41[PV/GRR]. (See Wheeler, 1989, for an another interpretation.)

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