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 Examples are ultrasound and MRI machines, PET and CT scanners, and x-ray machines. 2  Treatment equipment includes infusion pumps, medical lasers and LASIK surgical machines. 3  Life support equipment is used to maintain a patient's bodily function.here are several basic types: 1  Diagnostic equipment includes medical imaging machines, used to aid in diagnosis. 2  Examples are ultrasound and MRI machines, PET and CT scanners, and x-ray machines. 3  Treatment equipment includes infusion pumps, medical lasers and LASIK surgical machines.