following: 1) The process of selecting sample without bias against every member of the population.

2) It refers to the totality of all the members in a given study.

3) The process of selecting sample with tendency to be biased.

4) A sampling technique used when the area being considered is very large.

5) It refers to the information taken from respondents of the study directly.

6) The collection of data by the use of prepared questions to be answered by the respondents.

7) The process of gathering data through the behavior of the participants.

8) The process of obtaining the needed data from the documents.

9) The process of collecting data to find the accuracy and effectiveness of a certain activity.

10) It refers to the data coming from the published materials.​