In some cases,the 
-chart is used without an R-chart because there is no variation between the samples.
Definitions:
Increased Life Expectancy
A rise in the average number of years that individuals within a population are expected to live.
Degenerative Conditions
Degenerative conditions are illnesses or diseases characterized by the progressive deterioration of function or structure of affected tissues or organs.
Heart Disease
A range of conditions affecting the heart's structure and function, including coronary artery disease, heart attacks, and heart failure.
American Medical Association
A professional group in the United States that sets standards for medical education, practice, and ethics, and advocates for physicians and patients.
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