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.
Medicare Part B (Medical Insurance) covers medically necessary durable medical equipment (DME) that your doctor prescribes for use in your home. Only your doctor can prescribe medical equipment for you. DME meets these criteria: 1  Durable (long-lasting)  Used for a medical reason.