Checkpoint: Sampling Methods

A sampling method where every individual has an equal chance of being selected. Example: Drawing names from a jar.

A sampling method where you select every nth individual from a list. Example: Surveying every 5th student in a class.

A sampling method where you select individuals who are easiest to reach. Example: Asking friends in class for their opinions.

A sampling method where the population is divided into subgroups (strata) and random samples are taken from each. Example: Surveying students from different grades.

A sampling method where the population is divided into clusters, and entire clusters are randomly selected. Example: Choosing random classrooms to survey.

The entire group that you want to draw conclusions about. Example: All students at North River High School.

A subset of individuals selected from a larger population. Example: 100 students from North River High School.

Population includes all individuals of interest, while a sample is a smaller group selected from that population.

A sampling method where individuals choose to participate. Example: Online surveys where anyone can respond.

A systematic error that leads to an unrepresentative sample. Example: Only surveying students who stay after school.