A company working in the multimedia field wishes to conduct a survey of 500 SMEs in the Outaouais region in order to find out about the use of the Internet by these SMEs for electronic commercial transactions. Suppose that the company has in its possession a survey database comprising the complete list of names, addresses, telephone numbers... of these 500 SMEs.

We want to conduct a small survey of 20 SMEs in this region

Identify the following parameters:

- Sampling base

- Statistical unit

- Population size

- Required sample size

- Draw method: