Question

Identify which type of sampling is used: random, stratified, cluster, convenience, voluntary response, or systematic.

1. A local business man attends a community event highlighting local businesses and asks attendees how they feel about one of his new products.

2. A large company drug tests its employees once a month. It is too expensive to test all the employees so the company assigns a number to each employee and has a computer randomly generate 15 numbers each month. The numbers generated by the computer are used to select the employees that will be drug tested that month.

3. The major of a city randomly chooses 4 of the 20 wards in her city and surveys all the voters in those selected wards.

4. In order to gauge how voters feel about constructing a new high school on the west side of town, the school board surveys 75 voters from each of the 15 precincts.

5. Every third car in a police DUI checkpoint is stopped.

6. So that a university can assess undergraduate student satisfaction, undergraduate students are grouped according to their classification – freshman, sophomore, junior, and senior. Two of the 4 groups are chosen and all the students in those chosen groups are surveyed.

Answer 1

• Trick to identify sampling schemes:-
• Random:- samples are selected randomly and independently
• Cluster:- population division in part of group of elements
• Systematic:- selection process is in specific pattern.
• Voluntary response:- Question answer
• Convenience:- according to sampler samples taken as per requirement and convient manner.

1) voluntary response

2) random

3) cluster

4) convenience

5) systematic

6) stratified