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.
List of Durable Medical Equipment Items. This is a list of items you may need to use to manage your health or the health of a loved one. Many of these items are covered by Medicare. Air Cleaners. Air Conditioners. Air-Fluidized Bed. Alternating Pressure Pads and Mattresses. Audible/Visible Signal Pacemaker Monitor. Augmentative Communication Device. Bathtub Lifts.