1.3 Sampling Methods

Multiple Choice

Selecting employees at random from an employee directory, researchers contact 300 people and ask what obstacles (such as computer problems) keep them from accomplishing tasks at work.

• Simple random

• Stratified

• Cluster

• Systematic

• Convenience

Multiple Choice

Questioning university students as they leave a fraternity party, a researcher asks 463 students about their study habits.

• Simple random

• Stratified

• Cluster

• Systematic

• Convenience

Multiple Choice

After a hurricane, a disaster area is divided into 200 equal grids. Thirty of the grids are selected, and every occupied household in the grid is interviewed to help focus relief efforts on what residents require the most.

• Simple random

• Stratified

• Cluster

• Systematic

• Convenience

Multiple Choice

Every tenth person entering a mall is asked to name his or her favorite store.

• Simple random

• Stratified

• Cluster

• Systematic

• Convenience

Multiple Choice

Soybeans are planted on a 48-acre field. The field is divided into one-acre subplots. A sample is taken from each subplot to estimate the harvest.

• Simple random

• Stratified

• Cluster

• Systematic

• Convenience