Identify the following.

1. They are the persons whom the information is collected.

2. It is a quick and efficient way to obtain information from a large
number of respondents.

3. It is a technique which selects every nth element of the population
for the sample, with the starting point determined at random from
the first n elements.

4. It is used to indicate the position of a value, person or any quantity
in the given set.

5. It is a person-to-person encounter between the one soliciting
information and the one supplying the data.​