Chapter 5. Interpreting Data and Demonstrating Reliability
5.1. The Four Cases
From the following table it can be seen that there are four cases to be considered when interpreting k failures and T hours. First, there may be reason to assume constant failure rate, which includes two cases. If k is large (say, more than five) then the sampling inaccuracy in such a wide-tolerance parameter may be ignored. Chapter 4 has emphasized the wide ranges that apply and thus, for large values of k the formulae:
can be used. When k is small (even zero), the need arises to make some statistical interpretation of the data and that is the purpose of this chapter. ...
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