The range rule tells us that the standard deviation of a sample is approximately equal to one fourth of the range of the data. In other words s = (Maximum â Minimum)/4. This is a very straightforward formula to use, and should only be used as a very rough estimate of the standard deviation.
Often abbreviated as âDMEâ, durable medical equipment includes various types of walking aids, transfer equipment, bath safety and wheelchairs. As the name implies, this category must be manufactured and tested to be âdurableâ because patients who use this equipment rely on it to keep them safe and comfort.
This applies to the following medical products: 1  Medical X-Ray Diagnostic Equipments. 2  Haemodialysis Equipments. 3  Hollow Fiber Dialysers. 4  Blood Circuit Pipings in Vitro for Blood Purification Equipments. 5  Electrocardiographs. 6  Implantable Cardiac Pacemakers. 7  Artificial Heart-Lung Machines.