Because It is quicker and fast.
Sampling:
Sampling is a process used in statistical analysis in which a predetermined number of observations are taken from a larger population. The methodology used to sample from a larger population depends on the type of analysis being performed, but it may include simple random sampling or systematic sampling.
Sampling is the selection of a subset of the population of interest in a research study. In the vast majority of research endeavors, the participation of an entire population of interest is not possible, so a smaller group is relied upon for data collection.
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If signs are different you subtract. So 2.5- -1.25 equals 1.25 and keep the sign of the biggest number
The graph that has a slop of -1 and the y-interecept is 4
that graph is the 1st picture and top one
