The ratio of the variances of two independent samples from normal distributions with a common true variance has what type of distribution?
Response:
Which of the following will provide the BEST information for determining the value of reliability activities?
Response:
Product safety is a concern in today's environment. If a risk assessment is performed near the end of the design stage, consideration should be based on:
I. Hazard probability.
II. Hazard severity.
III. Risk impact.
IV. Cost impact.
Response:
A reliability test was terminated after 171 hours based upon a pre-established plan. An estimate of mean-time-to-failure of 57 hours was obtained. The lower 95 percent confidence bound on the true population mean-time-to-failure is:
Response:
Field data for 20 mechanical suspension systems showed 3 failure during the 12 month warranty period.
When failure occurred they were repair within 2 days and the system returned to operation. If the time of failure for the failed system were 4.4 moths, 6.3 months, and 10.7 months after placement in the field, what is the 90% lower confidence estimate on MTBF?
Response:
