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.
1 Durable and Home Medical Equipment and Supplies. 2 Library Reference Number: PROMOD00024. Published: August 30, 2016. Policies and procedures as of April 1, 2016. Version: 1.1. 2  A physicianâs signature on an order for DME, HME, or medical supplies authorizes those items to be. dispensed to the patient.