The points on any line or line segment can be put into one-to-one correspondence with real numbers so that two selected points can have coordinates 0 and 1, and that the distance between two points is the absolute value of the difference between the corresponding numbers

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected