Answer:
internal; external
Step-by-step explanation:
Ed, thinks that the professor slipped due to the fact that the professor was inherently clumsy. This means that he is claiming that the professor slipped because of his own fault. He deems the professor responsible for falling. Hence, Ed has made an internal attribution.
Violet, thinks that the professor slipped because of water being on the floor. So, she is claiming that the professor was not at fault. She, holds the water responsible for causing the professor to slip. She is not blaming the professor so, she has made an external attribution.