ASQ
CRE · Question #202
A randomly failing component is tested to r failures, and n observations are made. Degrees of freedom for calculating confidence limits on the mean should be:
The correct answer is B. 2r. See the full explanation below for the reasoning.
Data Collection and Use
Question
A randomly failing component is tested to r failures, and n observations are made. Degrees of freedom for calculating confidence limits on the mean should be:
Options
- A2r + 2
- B2r
- Cn
- Dn - 1
How the community answered
(30 responses)- A7% (2)
- B77% (23)
- C13% (4)
- D3% (1)
Topics
#degrees of freedom#confidence limits#chi-square distribution#MTBF estimation
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