Question

Jack tries to place magnets on the door of his refrigerator. He observes that the magnets don't stick. He guesses that the door of the refrigerator id made of non magnetic substance. What stage of scientific investigation does his guess represent?

Answer 1

It represents an observation and he formed a hypothesis to explain the observation.

Answer 2

His guess represents the hypothesis stage

Step-by-step explanation:

Placing the magnets and observing that they don't stick represents the first stage of scientific investigation: the observation.

Once he sees that, he makes his own guess about the cause of what he just saw. That guess ins't confirm or refuted util further investigation.

This is the definition of a hypothesis: a guess made by the recolection of data, that can be the start of an investigation or an argumentation.