Final answer:
State barber boards are established to oversee and protect the health, safety, and welfare of the general public by ensuring that licensed barbers meet designated standards.
Step-by-step explanation:
One key function of state barber boards is to protect the health, safety, and welfare of the general public. State governments utilize their reserved powers to regulate businesses and professions to ensure the welfare of citizens. This includes issuing licenses to professionals that may have direct contact with the public, such as barbers, to ensure they meet health and safety standards, which helps in preventing the spread of diseases and maintaining public welfare.