Final answer:
Medicaid is a joint health insurance program administered by states with federal funding, aimed at providing coverage to low-income individuals and varying by state.
Step-by-step explanation:
Medicaid is considered to be jointly administered because it is primarily administered by states using funding from the federal government. Created by Congress in 1965, Medicaid is a joint health insurance program that provides medical insurance for certain low-income people, including those below the poverty line, focusing on families with children, the elderly, and the disabled. Each state is responsible for administering the program, determining the level of benefits, and determining eligibility, which results in variations of the program from state to state.