Final answer:
Hume's test for meaningless philosophical terms involves examining if they can be tested in a laboratory. He argues that morality cannot be derived from factual statements because it is based on sentiments and beliefs.
Step-by-step explanation:
Hume's "test" for what we should do when we suspect people are using meaningless philosophical terms is to examine whether the terms can be tested in a laboratory, according to the idea motivating experimental philosophy. Hume argued that morality, for example, cannot be derived from factual statements about the world but is based on sentiments and beliefs. He believed that facts have to do with relations between objects, while morality has to do with human subjectivity and expressing sentiments about a matter.