When a researcher is successful at measuring what he or she intends to measure, this is called?

An economic system where all or most businesses are owned by government

Imagine a child who consistently gets mediocre grades and is often picked last for a team when games are played at recess. however, he likes to make silly jokes and play pranks, and he notices that people laugh when he does those things. the child starts to think that others are laughing with him, not at him. this is part of the process that charles cooley

How do the public-safety regulations protect workers ? regulations create advertising laws