Types of Samples Examples

Example 1: An online news site asks readers to take a brief survey about whether they subscribe to a daily newspaper.

• Self-Selected

• Convenience

• Simple Random (SRS)

• Stratified Random

• Cluster Random

Example 2: A survey of a city's residents is conducted by asking 20 people at a grocery store whether the city should impose a beverage tax.

• Self-Selected

• Convenience

• Simple Random (SRS)

• Stratified Random

• Systematic

Example 3: A survey of students at a school is conducted by asking 30 students randomly selected through a lottery system in an all-school assembly whether they walk, drive, or take the bus to school.

• Self-Selected

• Convenience

• Simple Random (SRS)

• Stratified Random

• Cluster Random

Example 4: Ms. Foy wants to know the percentage of juniors that will take two math classes their senior year. She asks the first 30 juniors she saw throughout the day.

• Self-Selected

• Convenience

• Simple Random (SRS)

• Stratified Random

• Systematic

Example 5: Ms. Eckstein wants to know the percentage of juniors that will take two math classes their senior year. She asks students in her class to place their response on a sticky note if they want to share their opinion.

• Self-Selected

• Convenience

• Simple Random (SRS)

• Stratified Random

• Cluster Random

Example 6: Ms. George wants to know the percentage of juniors that will take two math classes their senior year. She asks Mrs. Kelly to print out a list of all the juniors and picks every 10th student on the list.

• Systematic

• Convenience

• Simple Random (SRS)

• Stratified Random

• Cluster Random

Example 7: Mr. Nicholson wants to know student opinions regarding current cell phone policies. He randomly selects six classrooms and asks all students in those classes their opinion.

• Systematic

• Convenience

• Simple Random (SRS)

• Stratified Random

• Cluster Random

Example 8: Dr. Long wants to know student opinions regarding current cell phone policies. He randomly selects 100 students from each grade level and surveys those students regarding their opinion.

• Systematic

• Convenience

• Simple Random (SRS)

• Stratified Random

• Cluster Random