[Solved] What is a 404 error? What should you do if you receive this error message? Nonconforming Transistors: Transistors that do not meet specified criteria or operational standards set by quality control, often due to manufacturing defects. Electronics Company: A company that designs, manufactures, and sells electronic equipment, devices, and consumer products. Lower Control Limit: The lowest boundary in control charts that indicates the threshold below which a process may be out of control. Population Mean: The average value of a set of characteristics within an entire population.