Answer:
The process that the facilities supervisor is using to arrive at this hypothesis is inductive reasoning. Inductive reasoning involves making generalizations based on specific observations or patterns. In this case, the supervisor has observed a specific pattern (the lobby lights dimming when all elevators are in service), and from that, he is making a generalization (there might be an electrical problem related to the elevators). Inductive reasoning is a common method used in scientific inquiry, where specific observations or data are used to develop hypotheses or theories.