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:
Medicare eligibility rules dictate that a person can enroll in Medicare before the age of 65 if one or more of the below criteria are met: 1  You are a U.S. citizen or legal resident under 65 years old but have a qualifying disability (e.g. blindness) or a qualifying medical condition (e.g. Lou Gehrig's Disease).