For its validity, all hypothesis testing depends heavily on the assumption that the sample was drawn using probability sampling techniques

For its validity, all hypothesis testing depends heavily on the assumption that the sample was drawn using probability sampling techniques. For this discussion, answer the following:

Why is it important that a sample be random?

What can you do if you cannot use a probability sampling technique? (For example, suppose there is no good sampling frame available for the population of interest.)

Provide an example of a population and explain how you would collect a random sample from that population.