Final answer:
Associative entities in E-R diagrams are represented by a diamond shape, not a rounded rectangle, which is used for entities themselves.
Step-by-step explanation:
The statement is false. In an Entity-Relationship (E-R) diagram, an associative entity, which is used to represent a many-to-many relationship between two other entities, is typically represented by a diamond shape, not by a rounded rectangle. Rounded rectangles are used to represent entities themselves, while the actual relationships, especially many-to-many relationships that require an associative entity, are shown with diamonds. These associative entities are also known as bridge entities, link entities, or junction tables in database design. They include attributes that provide additional information about the associations and can have their own primary keys.