ABSTRACT
A reliability engineer at an electrical motor manufacturing firm wishes to calculate the test sample size that is required to assess the reliability of a new motor, which is about to be launched in the market. The historical reliability standard for electrical motors produced by this firm has been “at least 90% survival after 1000 hours.” The firm has conducted prior studies on similar motors, and believes that the “time to failure” distribution for the new motor is Weibull, with a shape parameter of 3.
