Some aspects of life testing.

Includes bibliographical references (page 46)This paper deals with some aspects of life testing. It begins with a definition and purpose for the study of life testing and progresses to a discussion of failure rate, an important factor in the science of life testing. It is established that there are certain items that exhibit a constant failure rate, and hence obey the exponential life distribution. It is with these items that the majority of this paper is devoted. A censored test plan of an exponential life distribution is discussed in Chapter 2 and certain important aspects of this plan are demonstrated. This includes finding the maximum likelihood estimate of the mean life, its density function, and material concerning the failure out of n items on test. Chapter 3 describes a truncated test plan for an exponential life distribution, using both finite and infinite lot sizes. This is related to the various quality levels required of the product. Single-stage plans are contrasted with multi-stage plans in this section. Chapter 4 concludes this paper with a discussion of the exponential distribution as a boundary between the increasing failure rate and decreasing failure rate distributions. It includes a description of tolerance limits and confidence limits