Answer:
In the mid-1990s, HMOs (Health Maintenance Organization) were effective at keeping down the costs of the insurance fee but the overall quality of the health services provided declined deeply, as the coverage for many necessary procedures were denied.
HMOs, like Blue Cross & Blue Shield, are medical insurance groups that provide health coverage for an annual fee.
<span>Experiments in which all variables are identical except for one are called controlled experiments. This where an observer tests his hypothesis by looking on changes that were brought about by one variable. The results are always dependent on one adjusted variable.</span>
C.
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