Describe the benefits and challenges of government social programs (such as medicare) and evaluate their importance to american society.

Medicare and Medicaid aimed to reduce barriers to medical care for America's most vulnerable citizens – aging adults and people living in poverty. ... Changes in the programs over the years have resulted in a significant shift for public insurance: One in three Americans is covered by Medicare or Medicaid.

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Explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

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explanation:

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