A variable that we purposefully change or manipulate is called the independent variable. The thing that changes in response is called the dependent variable. This creates a cause and effect relationship.
Medicare Eligibility Requirements. To be entitled to Medicare, you must be a U.S. citizen or a permanent legal resident, and answer yes to at least one (1) of the following questions:
A US citizen or legal permanent resident aged 65 years or older usually qualify for Medicare. One of the eligibility criteria is that the person or spouse must have worked in the US and paid Medicare taxes for minimum 40 quarters.