The statement is False. Use case diagrams are used in software development for identifying and organizing system requirements, not for showing how data is stored.
The statement "Use case diagrams help you diagram the relationship between how data is stored" is False. Use case diagrams are a tool used in software development to identify, clarify, and organize system requirements. They are part of the Unified Modeling Language (UML) and are used to describe the interactions between users (actors) and use cases, where a use case represents a sequence of actions in a system that yields an observable result of value to an actor.
The main purpose of a use case diagram is to show who interacts with the system and what the system does from the user's perspective. It does not show how data is stored or the internal workings of the system, which are typically represented in other UML diagrams such as class diagrams or entity-relationship diagrams (ERD).