Determine if the following situations use random or nonrandom sampling technique. Then, identify what type of random or nonrandom sampling technique is used. 2. There are 30 freshman, 20 sophomores, 10 junior, and 5 seniors enrolled in a certain course. Samples are taken from them according to the total number of students per year level. 3. Minority of senators are to be interviewed. 4. Every 5 files out of 500 files will be chosen.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.4: Collecting Data
Problem 6E
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Determine if the following situations use random or nonrandom sampling technique. Then, identify what type of random or nonrandom sampling technique is used.

2. There are 30 freshman, 20 sophomores, 10 junior, and 5 seniors enrolled in a certain course. Samples are taken from them according to the total number of students per year level.

3. Minority of senators are to be interviewed.

4. Every 5 files out of 500 files will be chosen.

5. Animals going astray are to be observed.

6. Two thousand respondents worldwide, from regions down to barangay, are selected for a national election survey.

7. Five hundred "likes" in Facebook are used for making decisions.

8. Selected respondents for a study are those with Acquired Immune Deficiency Syndrome (AIDS).

9. Ten names of students were picked out from a box containing 1, 000 names written in rolled papers.

10. Respondents are chosen from a list in the telephone directory. 

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