Degrees of freedom represents the number of independent differences in a given set of data.  	 	References in this course: M1L2T2, p. 12/32
Dispersion (or variation) describes how the data is spread out, or dispersed, from the central value.	 	References in this course: M1L2T2, p. 4/32
Drift is the gradual change in the readout of a weighing instrument at a constant load.		References in this course: M2L3T2, p. 9/33; M2L4T1, p. 2/19