The Range is the difference between the largest and smallest data value.  It is always reported as a positive number.		References in this course: M1L2T2, p. 10/32
A balances readability is the smallest fraction of a scale graduation that can be estimated or read using the digital read-out or a vernier.		References in this course: M2L3T1, p. 6/15
Reference density is a conventionally chosen density of the mass standards used to define and adjust the conventional mass display on balances.		References in this course: M2L3T1, p. 6/15
Reference standards are generally of the highest metrological quality available at a given location, from which measurements made at that location are derived (HB 143, HB 150, VIM 6.6). 		References in this course: 	M2L1T1, p. 8/13
Repeatability deals with being able to acquire similar measurement results when using the same procedures, same item, same operators and within the same laboratory at different times, perhaps every 24 hours.		References in this course: M1L2T2, p. 20/32; M2L3T1, p. 6/15
Reproducibility means the measurement standard deviations between laboratories are the same when the procedures are conducted under the same conditions but different operators and laboratories such as in round robin testing.		References in this course: M1L2T2, p. 20/32
The standard deviation is another expression of the variability of a data set.  It accounts for  the distance between the calculated mean value and every observed value. This distance is called the "deviation from the mean" or sometimes just residual, r.		References in this course: M1L2T2, p. 11/32




