Determine what type of sampling technique is illustrated in the given situation.

1. A researcher uses random numbers to select a sample from the population.

2. Every 100th hamburger manufactured is checked to determine the fat content.

3. A head nurse selects 10 patients from each floor of a hospital.

4. A teacher chooses his advisory class as the respondents of his study.

5. A researcher selects the diabetic patients admitted in the hospital as the respondents of his study on the lifestyle of diabetic patients.

6. A teacher writes the names of each in a card, shuffles the cards, and then draws five names.

7. A researcher wants to determine family background of drug addicts in their place. He has identified one drug addict as one of the respondents which help him in finding the other respondents in his study.

8. A physician decides to take a random sample of hospitals in a large metropolitan area. From each hospital included in the sample he takes a random sample of staff nurses. He interviews the nurses to determine where they attended medical school.

9. A researcher wants to determine the opinion of the students in a certain university on the K -12 program of DepEd. He divided the population according to the courses of the students and from each group he takes the sample randomly.

10. A researcher wants to determine the opinion of the mall goers regarding the APEC summit. He interviews the first 30 persons entering the mall.