Which is not described by Kerlinger as a method of controlling extraneous variables?
1). Purposive sampling
2). Selection
3). Randomization
4). Matching.
Purposive sampling is the right answer
1. a direct interview is always
2. The main problem in questionnaire is
3. The wrong statement related with research in
5. An instrument used in method is called
6. The grounded theorist is finished analyzing data when theoretical saturation occurs.
9. Which of the following statements is true for reliability and validity of a measuring instrument?