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.
TRICARE covers durable medical equipment (DME) when prescribed by a physician. 1  DME is defined as an item that: 2  Can withstand repeated use; 3  Primarily and customarily serves a medical purpose; and. 4  Generally is not useful to an individual in the absence of an injury or illness. more information...