research.

1-what is the design of the questionnaire? Complete. 1-A population____ has a limited number of individuals or objects.

2-In order to avoid the impossible and impractical task of observing all the regulatory elements, I will be a ___ of the ____ element of the population.

3-The sources of statistical information are ___ and ___.

4-The techniques used to choose the sample units are called _____.