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.
4) Durable medical equipment: Wheel chair, commodes and raised toilet sheet, walker and power operated vehicles which improves the quality of living of the patients are known as durable medical equipment. It also includes iron lungs, oxygen tents, nebulizers, catheters and hospital beds.
(Learn how and when to remove these template messages) Durable Medical Equipment (DME) is any equipment that provides therapeutic benefits to a patient in need because of certain medical conditions and/or illnesses. Durable Medical Equipment (DME) consists of items which: 1  are primarily and customarily used to serve a medical purpose; 2  are not useful to a person in the absence of illness, disability, or injury; 3  are ordered or prescribed by a physician;  are 1  reusable; can stand repeated use, 2  and. are appropriate for use in the  home.