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 is made of a nonmagnetic substance. what stage of scientific investigation does his guess represent?

Jack's guess that the refrigerator door is made of a nonmagnetic substance represents the stage of constructing a hypothesis in the scientific investigation process. After observing that the magnets do not stick to the door, he forms a tentative explanation or educated guess to explain this observation, which is precisely what a hypothesis is-a testable and logical proposed explanation based on observations